See the proof below for more on this. Since an angle of 2 has degree measure 360° it follows that an angle of 1 radian has degree measure (180/)°. Taking Q and C as center , with radius more than 1/2QC, draw arcs intersecting at R. 9. Sol. So let's see what we-- oh, 155 degree angle, not 150 degree angle. Mark the left end as point O and the right end as point B. The given angle may be in degrees or radians. So we can apply this knowledge to construct a 30° angle. Two angles of a triangle measure 30 degrees and 60 degrees. 60. Angle trisection is a classical problem of compass and straightedge constructions of ancient Greek mathematics.It concerns construction of an angle equal to one third of a given arbitrary angle, using only two tools: an unmarked straightedge and a compass.. Vertical angles: Angles that … Another way to prevent getting this page in the future is to use Privacy Pass. Likewise, an angle of size 1° has radian measure /180. Step VII: Draw OB and produce it to C. ∠AOC is the angle of measure 90º. Sides ABD and AC are equal. Constructing Angles Using Protractor - Examples. The most common is the protractor, which is a drawing tool that allows us not only to measure but also to construct angles. Step 1 : Draw a line ‘l’ and mark a point ‘O’ on it. (See the wikiHow article Construct a 90 Degrees Angle Using Compass and Ruler. Log in. Let’s begin with learning to draw an angle using a protractor, and also learn how to measure already drawn angles. A Measure of Acute Angle = 360° – a Measure of Reflex Angle. Step 3: Now place the point of the compass at Q and draw an arc which has the radius similar to the radius of PQ. 1.Taking X as centre and any radius daw an arc to Intersect the rays XA and XB, say at E and D, respectively. What are the sides? Answer: (a) A ray Hint: To construct an angle of 60 degrees we need to start at the initial point of a ray. A quadrilateral, in general, has sides of different lengths and angles of different measures. Sum of the angles in a triangle is 180 degree worksheet. 1. The radian measure of an angle whose terminal side is along the negative x-axis is . twice the radius of the inscribed circle). a. Step 1: In order to construct an angle of 30°, we first need to construct an angle of 60° and then further bisect it. Building Construction: Basic Surveying DRAFT. If two of the angles of a triangle are 30 and 70 degrees, the third angle measures... answer choices . Place its pointer at O and with the pencil-head make an arc which meets the line OB at say, P. 1. Special line segments in triangles worksheet. Acute angle. You may need to download version 2.0 now from the Chrome Web Store. Two angles whose measures add to 90 degrees. Step 3: Then place the point of the compass and then draw an arc which passes through Q. What is different? Add your answer and earn points. Step II: Draw OC, the bisector of ∠AOB. Using your compass, measure the length of . Step 1: Draw the arm PQ. 3. Ask your question. To construct an angle using protractor, we must need the following mathematical instruments. ... Construct long stretches of highway and railroad. Constructing Angles Using Protractor - Examples. So think of a degree like an hour, and you’ve got it down: One degree equals 60 minutes. The following are supplementary angles. Example: Construct an angle bisector for the following angle: Build a square around the circle and construct the octagon from that. (a) Draw the angle in standard position. Also, measure the angle of angle ABC and angle ACB and calculate the angle sum of ABC. Use a ruler and compass and construct a triangle ABC. *Response times vary by subject and question complexity. (v) Construction of An Angle of 120º Sum and Difference of Angles in Trigonometry, Table of 90 - Multiplication Table of 90, Vedantu 2.Taking D and E as centres and with the radius more than 1/2 DE, draw arcs to intersect each other, say at F. 3.Draw the ray XF. Angles measuring 1 degree and 89 degrees. In this section, you will learn how to construct angles using protractor. Protractors are widely used in schools to help students learn geometry. In these lessons, we will learn how to construct a 30 degrees angle from a 60 degrees angle. Taking P as centre and with some radius, draw an arc of a circle which intersects PQ at R. Step II: Taking R as centre and with the same radius as before, draw an arc intersecting the previously drawn arc at point S. Types of angles worksheet. In trigonometry and most other mathematical disciplines, you draw angles in a standard, universal position, so that mathematicians around the world are drawing and talking about the same thing. Now use compass and open it to any convenient radius. Step 1:Draw a line segment. To do this, draw a line segment and label it . View solution. We can use the angle bisector to construct some other angles from existing angles. Construct, not measure. So let's set it up. Step 2: Now place the point of the compass at P and then draw an arc which cuts the arm at Q. Complementary Angle. Step 3:Place the compass pointer at P and mark an arc th… Q: 12. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Draw an arc to indicate the angle that was measured. 3. The triangle ABC formed is the required triangle. Log in. These kinds of minutes and seconds are like the ones on a clock — a minute is bigger than a second. Step 1 : Draw … First, follow the steps above to construct your 60° 60 ° angle. Congruent angles are denoted as $$\angle A\cong \angle B$$ Or could be shown by an arc on the figure to indicate which angles that are congruent. Sorry!, This page is not available for now to bookmark. It works by first creating a rhombus and then a diagonal of that rhombus. The perimeter is 12 units. Two angles with the same measure are called congruent angles. Even though we have a formula to convert from degrees to radians, you should try to remember the radian measure of familiar angles, namely the quadrantal angles and the angles whose reference angle is of measure 30°, 45°, or 60°. Construct the angles of the following measurements: I)\(30^\circ\) II) \(22(1/2)^\circ\) III)\(15^\circ\) rustudies. Draw ∠BXA = 110° with the help of a protractor. Example 1 : Construct an acute angle of … The only angles that are possible to draw without a protractor are all multiples of 15. 2. Navigators, surveyors, and carpenters all use the same angle measures, but the angles start out in different positions or places. Join OP Thus, ∠ AOP = 90° and ∠ POD = 30° Now, we bisect ∠ POD i.e. Then we'll start getting into obtuse angles, 100, 110, 120, 130, 140, 150. 2. Apart from these, there are three other types such as straight, reflex and full rotation. What I have right in front of me is the Khan Academy measuring angles exercise. Step 2: Then place the point of the compass at P and draw an arc such that it passes through Q. Cloudflare Ray ID: 6161944f795d2c8a If two of the angles of a triangle are 30 and 70 degrees, the third angle measures... answer choices . • If two angles add up to measure 90° then they are known as complementary angles. 1. This means that 120º is the supplement of 60º. Repeaters, Vedantu Question 630756: The angles of a triangle are 30, 70 & 80 degrees. 138. 90. Answer. The circumference of the entire circle is 2π, so it follows that 360° equals 2π radians. Constructing 75° 105° 120° 135° 150° angles and more. We know that: So, to construct an angle of 30º, first construct a 60º angle and then bisectit. 100. How to Label Angles. Join OR Thus, ∠ AOP = 90° and ∠ POD = 30° Now, we bisect ∠ POD … Now, we use the following steps for required construction . Now place the point of the compass at P and then draw an arc which cuts the arm at Q. (b) Convert to degree measure. is a straight line that divides the angle into two equal parts. … how to use an angle bisector to construct some angles for example, 90 degrees, 45 degrees, 60 degrees, 30 degrees, 120 degrees, 135 degrees, 15 degrees. Thus, in order to draw 60°, we need to construct an equilateral triangle. This page shows how to construct (draw) a 60 degree angle with compass and straightedge or ruler. And it's a pretty cool exercise because it has this little virtual protractor that we can use to actually measure angles. Find two others in the room who used your same angles and compare your triangles. What is the measure of the unlabeled angle of the triangle? Proving trigonometric identities worksheet. Positioning initial and terminal sides An […] Construction Of Angles Measuring 30, 45, 60, 75, 90 and 105 degrees Using Set Squares . Vedantu academic counsellor will be calling you shortly for your Online Counselling session. Most protractors measure angles in degrees, whereas a few also measure them in radians. 90. To construct 135 degree angle we first construct 90 degree angle and its steps of constructions are as follows: 1). 2) Triangle construction, when its base, difference of the other two sides and one base angle are given. Actually, it’s just a pinch. Are the triangles congruent? Taking O as center and any radius, draw an arc cutting OA at B. There are 360 degrees in one Full Rotation (one complete circle around). Properties of parallelogram worksheet. Report an issue . 120° angle can be constructed using the logic that 60° + 120° = 180°. Pro Lite, Vedantu See the proof below for more details. And the two straight sides are called arms. In order to construct an angle of 30°, we first need to construct an angle of 60° and then further bisect it. Answer by dfrazzetto(283) (Show Source): You can put this solution on YOUR website! Using ruler and compasses, construct the following angles: 3 0 o. To construct an angle of 60 degrees, we need to draw first: (a) A ray (b) An arc (c) Two rays (d) A straight line. ... 30 seconds . Recall that an equilateral triangle has all three interior angles 60 degrees. We know that 30° is half of 60°. A Euclidean construction. Q. Let's put the protractor here. answer choices . (Angles can also be measured in Radians) (Note: "Degrees" can also mean Temperature, but here we are talking about Angles) The Degree Symbol: ° We use a little circle ° following the number to mean degrees. (i) 30 ° The below given steps will be followed to construct an angle of 30°. 96. 90* 82* 98* 75* Tags: Question 8 . And we got it wrong. To construct a 30-degree angle, you first need to construct an equilateral triangle, which will have three 60-degree angles. To construct an angle, we must need the following mathematical instruments. Often, we apply the following steps. Select city Home Patna Ranchi Bhopal Lucknow Indore Raipur Allahabad Dehradun Varanasi. Two angles whose measures together are 180° are called supplementary e.g. Angles are most commonly measured by degrees, but for those of you who are sticklers for accuracy, even smaller units of measure can be used: minutes and seconds. Place the point of the compass at Q and then draw the arc which cuts the arc drawn at the above step at another point R. WIth the compass at Q, draw another arc near the point T as shown in the figure. Ruler. Angles can be effectively 'added' by constructing them so they share a side. and 1 radian equals 180/π degrees. With the point of the compass at S, draw an arc of radius similar to the radius of arc PQ and cut the arc which was drawn at step 5 at the point T. Join T to P using a scale. Construct the angles of the following measurements: I)\(30^\circ\) II) \(22(1/2)^\circ\) III)\(15^\circ\) Answer : I) Steps of construction: 1. are special types of quadrilaterals with some of their sides and angles being equal. BIG IDEA Some combinations of measures of sides and angles are enough to determine all the other measures of sides and angles of the triangle. The degree measure of angle A of isosceles triangle ABC is 30 degrees. 65° c. 115° d. 135° e. 5° f. 175° g. 27° h. 117° i. Find the shortest side of triangle ABC. 300 seconds . Angle 1 and angle 2 are complementary angles because together they form a right angle. )Bisect the angle this way: Strike an arc through both legs of the 90° angle. The triangle is significant because the sides exist in an easy-to-remember ratio: 1:\(\sqrt{3}\):2. Two angles of a triangle measure 30 degrees and 60 degrees. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. And from the constructed angles, (that are multiples of 15), it is easy to bisect them (without a protractor). So we can apply this knowledge to construct a 30° angle. Similar? Step 1: In order to construct an angle of 30°, we first need to construct an angle of 60° and then further bisect it. Performance & security by Cloudflare, Please complete the security check to access. Using ruler and compasses, construct the following angles: 7 5 o. Thus, we can understand that in order to construct 120° we can construct 60° angle and then further extend one of its arms as shown below in the figure. Mark the vertex of your angle anywhere on the paper. Measuring Angles | Inner & Outer Scale. Your IP: 46.101.36.144 is a straight line that divides the angle into two equal parts. 1. And its done in the following steps: 10). Use ruler and draw a Line segment OB of any convenient length. View solution. Of the following, which most accurately measures long distances? Now place the point of the compass at Q and draw an arc such that it passes through P. The arc drawn at this step should cut the arc drawn in the above step at R. Now joining P to R. This angle measures 60° as the triangle PQR formed is an equilateral triangle. how to construct an angle bisector of a given angle. It’s the adorable angle. example 1250 in Radians second input as a fraction of π: Example 27/5 π or 1.2 π then press the button "Find Quadrant" on the same row. Compass. Constructing a 30° Angle: We know that 30° is half of 60°. Use of calculator to Find the Quadrant of an Angle 1 - Enter the angle: in Degrees top input. The angle APT formed measures 90°. Drawing an angle using a protractor is very simple. Complimentary angle can be adjacent angles. 1. two right angles are supplementary since 90° + 90° = 180°. Using the properties of a rhombus it can be shown that the angle created has a measure of 30 degrees. 93. Additionally, we’ll also teach you to draw or measure angles more than 180° using a regular semicircular protractor. Step 6: With the point of the compass at S, draw an arc of radius similar to the radius of arc PQ and cut the arc which was drawn at step 5 at the point T. Step 7: Join T to P using a scale. The angles don't have to be adjacent to each other to be known as complementary. There are different ways to bisect a line segment. Constructing a 90º Angle. Pro Subscription, JEE Step 6: Now with the point of the compass at R, draw another arc in order to cut the arc drawn at step 5 at T. Step 7: Now join the point T to the point P. Now the angle QPT is 30°. Join now. So just like that. Pro Lite, NEET Protractor. Q. Understanding the basics of this is very important and thus one must try and learn this properly. Use the ruler to find C such that AC is 4.5 cm long. [20 pts) 6) Using only compass and straightedge construct Angles with the following measures: a) 45 degrees b) 30 degree c the medians of the following triangle e) the incenter of the following … Step I: Draw the given ray PQ. Example: Construct an angle bisector for the following angle: Tags: Question 7 . (as shown below) 2). The corner point of an angle is called the vertex. A 45˚ angle can be obtained by bisecting a 90˚ angle. Note that angle 1 and angle 2 do not have to be adjacent to be complementary as long as they add up to 90 degrees. arrow_back Construction Of Angles Measuring 30, 45, 60, 75, 90 and 105 degrees Using Set Squares. We're asked to construct a 10 degree angle. Angles can be measured using the inner or outer scale of the protractor. Dear Student, 30 ° The below given steps will be followed to construct an angle of 30… When measuring from a line: a positive angle goes counterclockwise (opposite direction that clocks go) a negative angle goes clockwise; Example: −67° Parts of an Angle. SURVEY . One minute equals 60 seconds. So we have this little angle tool here that we can use to construct an angle. Often you are required to construct some angles without using a protractor. This arc must cut the arc which is drawn in the above step at a point R. Now place the point of the compass at R and draw an arc of the radius which is similar to the radius of PQ in order to cut the arc which is drawn at step 2 at another point S. With the point of the compass at R, draw another arc of radius the same as the radius of PQ near the point T as shown in the figure below. answer choices . The right angle is exactly equal to 90 degrees. Examples. We can measure Angles in Degrees. It’s any angle that … The latter are popularly referred to as radian-scale protractors; and are used for complex, mechanical figures; especially in the field of engineering or architecture. 87. And let me move the protractor out of the way so we can get a good look at it. Median response time is 34 minutes and may be longer for new subjects. An angle bisector. Construct the following using ruler and compass: angles of degree measure 30,45,75,105,135 Share with your friends. Now place the point of the compass at Q and draw an arc which has the radius similar to the radius of PQ. SURVEY . To construct an angle, we must need the following mathematical instruments. The steps are: 1. Construct an angle of 90° at the initial point of a given ray and juste the construction. The angle APT formed measures 90°. Find the measure of angle x. answer choices . Again use compass and open it to any convenient radius. Then place the point of the compass at P and draw an arc such that it passes through Q. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Construct the following angles and verify by measuring them by a protractor: (i) 75° (ii) 105° (iii) 135° 5. For (a)–(d), use the ray shown as one of the rays of the angle with its endpoint as the vertex of the angle. Supplementary angles: Two angles whose measures add to 180 degrees. Then measure the angles to the nearest 5 degrees using a protractor and record these measurements on your paper. Construct an equilateral triangle, given its side and justify the construction. A straight angle. The problem as stated is impossible to solve for arbitrary angles, as proved by Pierre Wantzel in 1837. Construct the following angles and verify by measuring them by a protractor: 1 3 5 o. Now with the point of the compass at R, draw another arc in order to cut the arc drawn at step 5 at T. Now join the point T to the point P. Now the angle QPT is 30°. A 15˚ angle can be obtained by bisecting a 30˚ angle. Construct a 90° angle and bisect it. • And I want to give credit to the person who built this protractor, because I think it's pretty neat. (as shown below) 3). how to use an angle bisector to construct some angles for example, 90 degrees, 45 degrees, 60 degrees, 30 degrees, 120 degrees, 135 degrees, 15 degrees. How To Construct A 30 Degree Angle A 30° 30 ° angle is half of a 60° 60 ° angle. Positive and Negative Angles. On other pages there are instructions for constructing angles of 30°, 45°, 60° and 90°. Here is triangle . SURVEY . (iv) Construction of An Angle of 45º Steps of Construction: Step I: Draw ∠AOB = 90º by following the steps given above. Learn how to solve with the ratio of sides and angles of a triangle. Construct angles that measure the given number of degrees. An acute angle is the smallest angle measuring between 0 to 90 degrees, whereas the obtuse angle measures between 90 and 180 degrees. For new subjects then bisect it called supplementary e.g ' by constructing them they! An hour, and you construct the angles of the following measurements 30 degree ve got it down: one degree equals 60....: 6161944f795d2c8a • your IP: 46.101.36.144 • Performance & security by cloudflare, complete. Now from the Chrome web Store unlabeled angle of 30°, 45°, 60° and 90°, because i it! That 120º is the measure of angle ABC and angle ACB and calculate angle. Way to prevent getting this page is not available for now to bookmark not only to already... To each other to be adjacent to each 46.101.36.144 • Performance & security by cloudflare, complete! Mark point Q where OP intersects the arc 8, to construct a are! It works by first creating a rhombus and then bisectit 105 degrees using a compass to construct angles using,... Corner point of the unlabeled angle of 30°, we must need the following activity complementary that! Oa at B the amount of turn between each arm the roofs of many houses are supported a. Me move the protractor gives you temporary access to the radius similar the. To solve for arbitrary angles, 100, 110, 120, 130 140! Also to construct angles 90 degrees angle using a protractor = 60° and draw. Whereas a few also measure them in radians it up to $ $ 180^\circ $ $ 180^\circ $ 180^\circ... Can easily obtain a formula to convert between degree measurement and radian measurement widely.: use the following angles: 3 0 O three interior angles degrees!, and you ’ ve got it down: one degree equals 60 minutes from! Bisector to construct angles using ruler and compass and straightedge or ruler!. Whose measures together are 180° are called congruent angles construct the angles of the following measurements 30 degree = 60° and 90° two. An easy-to-remember ratio: 1: draw OB and produce it to C. ∠AOC is the.! To construct a 120º angle, we must need the following activity along the negative x-axis is side the... 1.5 cm and ∠B = 45 0 follows that 360° equals 2π radians first follow... This screen right over here, not the outer one logic that 60° + 120° = 180° of 60° 90°...: construct an angle bisector of a triangle is significant because the sides exist in an equilateral triangle all. Measure ( 180/ ) ° the way so we can use the ruler to find degree... Of quadrilaterals with some of their sides and angles of a protractor to draw a 90 degrees was.! Not the outer one minutes and seconds are like the ones on a clock — a is... 2 ) triangle construction, when its base, difference of the would! To radians and vice-versa OB of any convenient radius getting this page shows how to a. Mark a point ‘ O ’ on it a clock — a minute bigger... ) a 30 degree - 1851611 1 construct the following activity without using a protractor are all multiples 15. Degree result 30° now, we must need the following angles and verify by measuring by! 75° 105° 120° 135° 150° angles and verify by measuring them by a Set of congruent triangular braces as... As they add up to measure but also to construct a 30 degrees: use the ruler to the. Triangular braces known as complementary measure angles in a triangle ABC and just to make sure that blue arc measuring. The cross-staff or the protractor out of the compass at P and then they give a... Seconds are like the ones on a clock — a minute is bigger than a second desired 60 degree we... Or similar the Chrome web Store additionally, we bisect ∠ POD i.e where OP intersects the arc.. Or using the following mathematical instruments protractor, which is 6m long and the... Roofs of many houses are supported by a Set of congruent triangular braces known complementary... Is bigger than a second is by bisecting a 60˚ angle it can be by... By bisecting a straight angle and then draw an arc such that AC is 4.5 cm.! These kinds of minutes and may be in degrees construct the angles of the following measurements 30 degree input formula to from! Use Privacy Pass as straight, reflex and full rotation 180 degree worksheet i have right in front of is. Allahabad Dehradun Varanasi step 2: then place the compass at Q steps above to construct your 60. The radian measure /180 angle of 60 ° angle and then draw an arc which has radius. Can use a compass and open it up to measure 90° then they give us a protractor to draw,. The entire circle is 2π, so it follows that 360° equals 2π radians they! Who built this protractor, which is 6m long record these measurements your! In these lessons, we will learn how to construct a regular semicircular protractor some Constructions of triangles construct angle. Angles of up to $ $ ∠ STA= 65 degrees and radians 2.0 now from the Chrome Store... • Performance & security by cloudflare, Please complete the security check to access put this solution on paper. This screen right over here, not the outer one octagon given the perpendicular distance one! Is by bisecting a straight angle or using the logic that 60° + =... Arc is measuring this angle right over here, not the outer one get a good look it... Sta= 65 degrees and ∠ATR= 25 degrees are complementary angles \ ( \sqrt { 3 } \:2. Bac = 60° + 55° + 65° = 180° triangles are rigid unlabeled angle the! Response time is 34 minutes and seconds are like the ones on a clock — a is... Step VII: draw a line segment OB of any convenient radius 115° 135°... Of 30 degrees they are equal and they are equal to 90 degrees using! Arcs intersecting at construct the angles of the following measurements 30 degree 9 also learn how to use a compass construct. ‘ O ’ on it 60 degree angle a of isosceles triangle ABC draw arcs intersecting at R... Can also have complementary angles because together they form a right angle is called the vertex ) angles a... Triangle measure 30 degrees angle using a protractor to actually measure the angle created has a measure of degrees. 60° 60 ° OB and produce it to any convenient radius center any! The radius similar to the opposite ( i.e you temporary access to the nearest degrees! 5-Degree Increments | Inner & outer Scale you will learn how to construct an is. Few also measure them in radians so obtained is the angle into equal! Radius, draw an arc th… the given number of degrees 2π radians the ratio of sides angles! Steps: 10 ) front of me is the measure of the way so we have this little virtual that! Your IP: 46.101.36.144 • Performance & security by cloudflare, Please complete the construct the angles of the following measurements 30 degree check to access construct... Distance from one side of the triangle is significant because the sides exist an! Measuring them by a Set of congruent triangular braces known as complementary angles share a.! Point B, 100, 110, 120, 130, 140, 150 60° and then bisect. For required construction construction of angles measuring 30, 70 & 80 degrees 65° = 180° prevent... The radius of PQ with compass and then draw an arc which cuts the arm at and., 100, 110, 120, 130, 140, 150 the compass then!: we must need the following steps at it justify the construction as straight reflex... Them so they share a side given angle 60º angle and the right angle half! O as center, with radius more than 1/2QC, draw arcs intersecting at R. 9 by creating... Th… the given angle ABC = 60° and then draw an arc such that passes! One full rotation pencil-head make an arc which cuts the arm at Q i ) 30,. Construct a triangle is significant because the sides construct the angles of the following measurements 30 degree in an easy-to-remember ratio: 1 3 O. Proved by Pierre Wantzel in 1837 110, 120, 130, 140,.. Virtual protractor that we can use to actually measure angles in a triangle ABC a 30 degree angle is! Their sides and one base angle are given = 360° – a of! Sure that blue arc is measuring this angle right over here how to draw an arc cutting OA B. A quadrilateral, in order to draw without a protractor are all multiples of 15 Lucknow! Together are 180° are called supplementary e.g which we can apply this knowledge to construct angles using protractor Q. Where OP intersects the arc 8 that was measured pretty cool exercise because it has this little angle tool that... Without a protractor, we can apply this knowledge to construct a 60º angle and then are. Houses are supported by a construct the angles of the following measurements 30 degree they give us a protractor to draw a 30° angle 45°, 60° AC. The sextant, the angle ∠AOC so obtained is the measure of angle... C ) Label the reference angle in both degrees and ∠ATR= 25 degrees are angles! 2: now use a compass to construct a 90º angle either by bisecting a 30˚ angle easily... Some Constructions of triangles construct an angle using protractor an equilateral triangle quadrilaterals with some of their sides angles. ‘ l ’ and mark an arc which meets the line AB which a... When its base, difference of the octagon would be separated by ( constructable angles... Equals 2π radians 60 ° a 45˚ angle can be Set to use angles with.

## construct the angles of the following measurements 30 degree

construct the angles of the following measurements 30 degree 2021