MEASURING ANGLES

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MEASURING ANGLES

Measuring angles is much easy after we started to use a mathematical tool, the protractor. In these printable measuring angles worksheets, we will learn to measure angles using a protractor. We have already learnt that two rays originating from a common end point form an angle.

The magnitude of an angle is the amount of rotation of one arm about the vertex to bring it to the position of the other arm. One complete rotation of a ray about a point is divided into 360 equal parts. Each part is considered 1° (one degree).

Measuring an angle using a protractor in anticlockwise direction: 

  1. This is measurement in anticlockwise direction. Thus, we will use the inner scale to measure the angle.
  2. The centre of the protractor is placed on the vertex B of the angle ABC. The base line of the protractor should coincide with the base BC of the angle.
  3. Read the markings where the arm BC overlaps the markings on the protractor. That measurement is the measure of the angle.
  4. Therefore, the angle ABC measures 45°

The same procedure is followed for measuring an angle in clockwise direction, but here the outer scale is used to measure the angle.

Download all the worksheets and learn to measure angles in a simple way.

 

Reading Protractor - Inner scale

Reading Protractor - Inner and Outer scale

Measure exterior angles using protractor

Measure angles formed by multiple rays

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