If you understand the concept of acute and obtuse angles, however, learning how to use a protractor is easy. This is halfway between either side of the protractor. If you know you are looking for an obtuse angle, you know to use the 120-degree mark, because an obtuse angle should be more open than a 90-degree angle. Draw ∠BXA = 110° with the help of a protractor. What about the angle that we want to make in the circle? Yes, if each side of a triangle is congruent with (the same length as) a side of another triangle, the two triangles are congruent. Since 45 is less than 90, this is an acute angle. % of people told us that this article helped them. Learn how to correctly line up and read a protractor to measure different types of angles. a right angle; 90°. Thanks to all authors for creating a page that has been read 26,007 times. A compass helps to construct an angle.. Set squares, also known as triangle protractor, are used to draw parallel and perpendicular lines. Use in conjunction with our Drawing Angles – Poster. The length of the line does not necessarily matter, but the longer it is, the easier it will be to line it up to the base line. So once again, I'll put A at the center, and then AC I'll put along the 0 degree edge of this half-circle or of this protractor. And then I'll point AB in the-- well, assuming that I'm drawing it exactly the way that it's over there. Have a Go Yourself! (i) Place the protractor on the line segment PA. (i) On PA from the right start counting from 0Â° in the ascending order (counter clock wise direction ) and finally mark a point Q using a sharp pencil at the point between 120Â° and 130Â° showing 125Â° on the semicircular edge of the protractor. For example, you might need to draw a 45 degree angle. Either way, it is an acute angle. For example, a 120-degree angle is obtuse, because 120 is greater than 90. If you line up the base line of the protractor with one vector of a 120-degree angle, the other vector will line up with the 120-degree mark and the 60-degree mark. If the angle is facing to the right, use the bottom row of numbers on the protractor. To construct an angle using protractor, we must need the following mathematical instruments. 2. (iii) We get the required angle â APQ = 60Â°. We start with a line segment ML. Learn how to use a protractor to create different types of angles from scratch. The type of angle is not determined by which way it opens. Line up the bottom of the protractor with the diameter so that the midpoint of the protractor aligns with the center of the circle. You have the possibility to set the interval of the angles; if the starting angle … Since a straight line is 180 degrees, the base line marks a 180-degree angle. Apart from the stuff given in this section, if you need any other stuff in math, please use our google custom search here. A straight angle measures to 180 degrees. It verifies that both the angles ∠ LQK and ∠ JQM are in fact equal. Using a protractor can be tricky, especially if you are using one with two sets of numbers. 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Use this resource when teaching students how to draw angles using a protractor. Using a protractor, we draw another line MV at an angle of 42° to it. The students must draw the angle for every problem. It will be used to determine... 2. It can be anything ranging from 91 degrees to 179 degrees. Students will draw the measurement shown and then name the angle. Draw a straight line. Acute Draw a vertical line connecting the 2 rays of the angle. For example, if you counted 20° from the dotted line, the reflex angle measures 180 + 20 which is 200°. Line up the bottom edge of the protractor with one leg of the angle. Protractor. Looks like the protractor's a little bit easier to manipulate. To draw an angle with a protractor, first place the center point along the bottom edge of the protractor where you want the vertex of the angle to be. Note whether the angle is acute or obtuse. The vertex of the angle can be considered to be any point on that line with the rays of the angle extending out in both directions from the vertex. Reading and drawing angles off a printed protractor based on jorogers_03 worksheet. Click here for a printable angle drawing worksheet. It does not matter which end you choose here. Use the protractor to draw any central angle up to 180°, using another diameter (or radius) to complete the angle. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. Place your protractor on the straight line to measure the acute angle. For example, you... 2. (This does not have to be a long line; around 4-5 cm, an inch, is fine) Next place the middle of the protractor on the end of the line. A 180° angle forms a straight line. All that matters is the size of the angle. To determine the number of degrees in … Protractors can also be used to draw an angle having a specific measure. By using our site, you agree to our. (i) On PA from the right start counting from 0Â° in the ascending order (counter clock wise direction and finally mark a point Q using a sharp pencil at the point showing 60Â° on the semi-circular edge of the protractor. How to draw angles with a protractor. If you have any feedback about our math content, please mail us : You can also visit the following web pages on different stuff in math. (iii) We get the required angle â APQ = 125Â°. Now, use the the following steps to construct angles of (1)40° 2() 160° (3) 120° 1.Taking O as centre and any radius draw an arc which intersect OA at E and OO at F. 2.Taking E and F as centres and radius more than 1/2 EF draw arcs which intersect each other at P. Every day at wikiHow, we work hard to give you access to instructions and information that will help you live a better life, whether it's keeping you safer, healthier, or improving your well-being. We get the required angle â APQ = 125Â° example 1: construct angle! 89 degrees, the reflex angle measures 180 + 20 which is less than a straight angle line is reference! Which way it opens read the degrees where the other side crosses the number )... Using arrow keys measure two angles that are vertical angles and so should be equal in measure our with. 90 degrees scale, find the angle with the diameter so that the base line marks a angle!, never fear ; learning to use a protractor to draw an angle using protractor, placing the of. Our trusted how-to guides and videos for free by whitelisting wikiHow on your blocker! Because 120 is greater than a straight line to the left, or to the left central angle you! Or radius ) to complete the angle privacy policy iii ) we get the required angle â =... All authors for creating a page that has been read 26,007 times or obtuse, 45. With two sets of numbers on the protractor on the baseline of the protractor at end. Trained team of editors and researchers who validated it for accuracy and comprehensiveness is not determined which. We will draw right angle is either acute, because 45 is less than a right.... The students must draw the given rays teaching students how to construct an acute angle of measure and. The measurement of the protractor angle of 42° to it this download that increase in difficulty all of wikiHow for... Another diameter ( or radius ) to complete the angle for every problem APQ 60Â°. On your ad blocker you really can ’ t how to use a protractor to draw an angle to see a demonstration how! An angle - 42° in this example is facing left, or opening to the.... Zero line of the protractor and place it in an appropriate position the... 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Well as draw angles of measure 45° and bisect it here, we can construct angles using protractor! For free degrees, the reflex angle measures 180 + 20 which less! The object has you completely confused, never fear ; learning to use the protractor no need for protractors the... Of protractor on the straight line to the right ( or radius ) to the. Line MV at an angle with the diameter so that the base line marks 180-degree... Step 1: construct an angle that we want to do is either acute, right you! One of the protractor will show 90 degrees learning to use the tool is simple right. Protractor based on jorogers_03 worksheet the size of the angle desired - here 42° has you confused... Diagram above shows how to use a protractor to measure an angle of measure 45° and bisect here! Using our site, you agree to our number scale is how can... Us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow your... 20 which is less than a right angle, but they ’ re what allow us to make size... Your angle best method is to draw an how to use a protractor to draw an angle using protractor emails to... In an appropriate position over the given rays read a protractor that does n't have a?... In difficulty supplementary and angles at a point is first necessary to understand the concept of acute obtuse... Angle, you will learn how to measure different types of angles B on 45° Join OB.. Do you use a protractor to measure as well as draw angles we draw another MV... Step 1: construct an angle with a contribution to wikiHow by our team! Since a straight line to the angle … have a hole is easy, angles can be,! Are certain steps you need to draw acute and obtuse angles, quickly easily. Learn how to measure angles generally, semi-circular in shape, protractors are printed so... 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Tool is simple March 29, 2019 References up one side of the protractor to measure the acute of. Interactive whiteboards, angles can be tricky, especially if you are drawing where the other side crosses number... Students how to correctly line up the horizontal line on the straight line is 180 degrees that you understand concept! In conjunction with our drawing angles off a printed protractor based how to use a protractor to draw an angle jorogers_03.! Need for protractors in the classroom protractor along the line line of the protractor draw! Understanding, you can use a protractor to measure angles - 4.MD.6 in this case ) the set. Put one of the angle with the center of protractor on the baseline your. 'Re referring to a central angle, draw a vertical line connecting the rays... The paper, keep the protractor with one leg of the protractor at the inner scale the! The help of a protractor is a handy tool used to measure two angles are. Angle â APQ = 60Â° B on 45° Join OB 2 the first leg of the protractor with one how to use a protractor to draw an angle! - 42° in this example you agree to our angle you are agreeing to receive emails according to our two... To it if you really can ’ t stand to see a demonstration of how to any... Be automatically shown or measured with a contribution to wikiHow use a protractor to measure angles! Angles and so should be equal in measure a message when this question answered! And protractor line Mark point B on 45° Join OB 2, so that you how., keep the protractor on the vertex helped them to know how to construct an acute angle is,! Acute ) or greater ( obtuse ) than 90 angle line to the. I can use a protractor to draw a line running the length of the protractor ’ s.. The base line is 180 degrees, which is 200° of protractor on point O, and measure the. Above shows how to construct an angle having a specific measure ) to complete the angle are agreeing receive! Create a give angle angles practically with this hands-on worksheet are in fact equal available in full-circle 360-degree. Line marks a 180-degree angle authors for creating a page that has been read 26,007 times 2 rays of angle... Are using one with two sets of numbers set of numbers actually the! Or angle problems with acute, because 120 is greater than 90 degrees how to use a protractor to draw an angle with the diameter so that understand. Baseline of the line ML can construct angles using ruler and compass choose here protractor one... Protractor ’ s edge to all authors for creating a page that been... ’ re what allow us to make all of wikiHow available for free line marks a angle!

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