Place center of protractor on point O, and coincide line OA and Protractor line Mark point B on 45° Join OB 2. It is first necessary to understand the features on a protractor, so that you understand how to use it. The protractors are printed, so no need for protractors in the classroom. Let's put the vertex of the angle at the center of the protractor, in other words, center the protractor at the center of the vertex. Note whether the angle is acute or obtuse. 45° using protractor. Place your protractor on the straight line to measure the acute angle. Use the protractor to draw any central angle up to 180°, using another diameter (or radius) to complete the angle. It does not matter which end you choose here. Drawing an Angle 1. By using our site, you agree to our. Normally, instead of moving the angle, you could actually move the protractor to the angle. For example, a 45-degree angle is acute, because 45 is less than 90. Last Updated: March 29, 2019 For a description of the protractor see The Protractor For a demonstration of using the protractor to draw an angle see Drawing Angles with a Protractor For example, if you counted 20° from the dotted line, the reflex angle measures 180 + 20 which is 200°. This line will form the... 3. Questions of increasing difficulty which should enable students to understand how to read angles off and draw an angle on printed protractors as a preliminary to using a real protractor. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. I can sketch angles when given a measurement. Grab your own protractor and place it in an appropriate position over the given rays. 1. % of people told us that this article helped them. Step 3: Using (in this case) the inner scale, find the angle desired - here 42°. (iii) We get the required angle â APQ  =  125Â°. This shows how to use a protractor to draw an angle - 42° in this example. 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. How do you use a protractor to draw an angle? Example 1 : Construct an acute angle of 60 °. 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. By signing up you are agreeing to receive emails according to our privacy policy. References. The worksheet contains 10 problems. All tip submissions are carefully reviewed before being published, This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. If one look at the object has you completely confused, never fear; learning to use the tool is simple. Line up the horizontal line on the baseline of your protractor, placing the center of your protractor over the vertex. How to draw angles with a protractor. In this case, we're going to rotate the protractor. Line up one side of the angle with the zero line of the protractor (where you see the number 0). Using a Protractor to Draw an Angle. To know how to construct angles using ruler and compass. It verifies that both the angles ∠ LQK and ∠ JQM are in fact equal. What about the angle that we want to make in the circle? Please consider making a contribution to wikiHow today. https://www.mathsisfun.com/geometry/protractor-using.html, http://www.mathopenref.com/angleright.html, http://www.mathwords.com/a/acute_angle.htm, http://www.mathopenref.com/constdrawangle.html, consider supporting our work with a contribution to wikiHow. Since 45 is less than 90, this is an acute angle. Using a protractor can be tricky, especially if you are using one with two sets of numbers. A 180° angle forms a straight line. If you're referring to a central angle, draw a diameter. It shows how to measure two angles that are vertical angles and so should be equal in measure. There are certain steps you need to follow when drawing an angle: First draw one of the lines. wikiHow is where trusted research and expert knowledge come together. Protractors can also be used to draw an angle having a specific measure. 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. Both the inner and outer sets of numbers on the protractor will show 90 degrees at this point. A straight angle measures to 180 degrees. 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. Label this point V. … Please consider making a contribution to wikiHow today. Use in conjunction with our Drawing Angles – Poster. For example, a 120-degree angle is obtuse, because 120 is greater than 90. You can use a protractor to measure and draw angles. We use cookies to make wikiHow great. An angle is either acute, right, or obtuse, no matter which way it opens. An acute angle is an angle from 0 to 89 degrees, which is less than a right angle. To draw 45° using compass, please check Ex 11.1, 2 of Class 9 NCERT We follow these steps Draw a ray OA 2. The line is your reference line and the first leg of your angle. Now, we use the following steps for required construction 1.Taking X as centre and any radius daw an arc to Intersect the rays XA and XB, say at E and D, respectively. Step 1 : Draw … Once you have this understanding, you can quickly use a protractor to make any size angle between 0 and 180 degrees. Draw a straight line. When you line up the base line of the protractor with one vector of a right angle, the other vector will line up with the 90-degree mark of the protractor. A right angle is an angle that is exactly 90 degrees. Place the centre of the protractor at the vertex dot and the baseline of the protractor along the arm … But if you were to turn that angle around so that it opens to the left, it would still measure 45 degrees, but this time when you measure it, you would have to look at the outer set of numbers. Drag the protractor and rotate it using arrow keys. Reading and drawing angles off a printed protractor based on jorogers_03 worksheet. And then I'll point AB in the-- well, assuming that I'm drawing it exactly the way that it's over there. This article has been viewed 26,007 times. It will be used to determine... 2. The type of angle is not determined by which way it opens. In this section, you will learn how to construct angles using protractor. We start with a line segment ML. To determine the number of degrees in … Learn how to correctly line up and read a protractor to measure different types of angles. 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