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Protractor

A protractor is a simple measuring instrument that is used to measure angles. A common protractor is in the shape of a semicircle with an inner scale and an outer scale and with markings from 0° to 180° on it. Architects and designers use a more precise protractor called an angle protractor tool which gives more accurate measures. Protractors have been in use since the seventeenth century. Later by the eighteenth century, protractors were widely used in geometry and mathematics.

What is a Protractor?

Protractor, in math, is considered to be an important measuring instrument that is in the shape of a semi-circle. The common protractor is a translucent tool that helps us measure angles in degrees. A radian scale protractor measures an angle in radians. If we observe the figure given below, we can see that a common protractor has degrees marked clockwise from 0° to 180° in the outer scale and anti-clockwise from 0° to 180° in the inner scale.

How to Measure angles using Protractor?

Suppose we have an angle to measure say, ∠ABC. Follow the steps given below to measure the angle.

Step 1. Put the protractor above the line BC such that the midpoint of protractor is at point B. Step 2. Adjust the protractor in such a way that BC is parallel to the straight-edge of the protractor. Step 3. The protractor has two ‘scales’ marked from 0 to 180 degrees on both the ends. Take the reading where BC coincides with the 0 degree. Step 4. Now from 0 degrees, check the ray BA coincides with the curved edges of the protractor. This reading gives us the measure of angle ABC.

Isosceles Triangle Example

360° Protractor

A 360° protractor is circular in shape and has readings up to 360° in the clockwise direction. It is commonly used in the field of architecture, mechanical drawings, and meteorology.

Important Notes:



Adjacent Angles

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