wikiHow is where trusted research and expert knowledge come together. Otherwise, you'll have to do more calculations to determine the degrees in the angle. Otherwise, if your angle opens to the right, use the number in the inner arc. Use the protractor to measure the third angle of the triangle you drew. they will add up to 180°. However, you'll get the same result no matter which line you use. The typical protractor is made of clear plastic and has two sets of numbers around the edge. Include your email address to get a message when this question is answered. Determine what type of angle you're measuring. The main problem with this protractor is that the 'origin' swivel point can't be accurately placed over the object you are trying to measure because you can't see where it is. To make sure you're right on the vertex, it can help to make a little dot inside the center of your protractor. When you add all 3 angles, what total do you get? This article has been viewed 15,918 times. Line up the short end of your ruler with the bottom ray, then draw a vertical line intersecting the other ray using the long side of your ruler. T-Bevel. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. X 6 measure the direction of rv with a protractor and. Focus on constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle. For more help, including how to calculate reflex angles with a protractor, read on! If an angle is less than 90 degrees, it's an acute angle. Line up one side of the angle with the zero line of the protractor (where you see the number 0). 3 Ways to Measure an Angle Without a Protractor - wikiHow Best www.wikihow.com. Place the midpoint of the protractor on the vertex of the angle. Use your protractor to measure an angle that is greater than 90 degrees. 2. When in doubt think "should this angle be bigger or smaller than 90° ?". It's great to use for homework, review, sub plans, early finishers, or ex What are the lengths of the horizontal leg and vertical leg of the right triangle formed? If one line is more horizontal, it will typically be the easiest one to line up along the baseline. Read the degrees where the other side crosses the number scale. Draw a vertical line connecting the 2 rays of the angle. By signing up you are agreeing to receive emails according to our privacy policy. If the angle you're measuring doesn't line up perfectly with a number, count the hash marks on the outside edge of the protractor to determine the degrees in that angle. Hence, measure of the given angle is 60° Variation: There are full-circle protractors that eliminate the need for this additional math. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/8\/83\/Measure-an-Angle-Using-a-Protractor-Step-1-Version-2.jpg\/v4-460px-Measure-an-Angle-Using-a-Protractor-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/8\/83\/Measure-an-Angle-Using-a-Protractor-Step-1-Version-2.jpg\/aid6897726-v4-728px-Measure-an-Angle-Using-a-Protractor-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"