A common protractor is in the shape of a semicircle that has an inner and an outer scale with markings from 0° to 180° on it. To reduce errors, align the baseline and vertex properly.įAQs on Protractor What is a Protractor in Geometry?Ī protractor is a simple measuring instrument that is used to measure or draw angles in degrees.If the angle to be measured is on the left-hand side from the center of the protractor, we use the outer readings of the protractor and if the angle to be measured is on the right-hand side of the center, we use the inner readings.The angle protractor tool and 360° protractor give more precise measurements. We can also use a 360° protractor to draw a reflex angle.It is commonly used in the field of architecture, mechanical drawings, and meteorology. Therefore, ∠CAB = 40°.Ī 360° protractor is circular in shape and has readings up to 360° in the clockwise direction. Step 5: Now using a scale, join A and C.Step 4: In the inner readings, look for 40º and mark it as point C.Step 3: Since the angle is drawn on the right-hand side of the vertex we will see the inner readings.Step 2: Align the baseline of the protractor on AB such that the center of the protractor is placed on point A.Let us see how to draw an angle of 40º using a protractor. In order to draw angles using a protractor, we use the following steps. This can be verified by the values, that is, 150º + 30º = 180º. It should be noted that ∠AOC + ∠BOC form a straight line and hence add up to 180. Step 2: Check the reading where the ray OC is formed.Since we need to measure ∠AOC, which is formed on the left-hand side of the center, we will use the outer readings which go clockwise. ![]()
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