CONSTRUCTION OF ANGLES USING PROTRACTOR

In this section, you will learn how to construct angles using protractor.

To construct an angle using protractor, we must need the following mathematical instruments. 

1. Ruler

2. Protractor

Constructing Angles Using Protractor - Examples

Example 1 :

Construct an acute angle of 60°.

Step 1 :

Draw a line segment PA.

Step 2 :

(i) Place the protractor on the line segment PA

(ii) Place the mid point of the protractor at point P as shown in the figure.

Step 3 :

(i) On PA from the right start counting from 0° in the ascending order (counter clock wise direction and finally mark a point Q using a sharp pencil at the point showing 60° on the semi-circular edge of the protractor.

(ii) Remove the protractor and join PQ.

(iii) We get the required angle ∠APQ  =  60°.

Example 2 :

Construct an acute angle of 125°.

Step 1 :

Draw a line segment PA.

Step 2 :

(i) Place the protractor on the line segment PA.

(ii) Place the mid point of the protractor at point P as shown in the figure.

Step 3 :

(i) On PA from the right start counting from 0° in the ascending order (counter clock wise direction ) and finally mark a point Q using a sharp pencil at the point between 120° and 130° showing 125° on the semicircular edge of the protractor.

(ii) Remove the protractor and join PQ.

(iii) We get the required angle ∠APQ  =  125°.

Apart from using protractor, we can construct angles using ruler and compass also.

To know how to construct angles using ruler and compass, 

Please click here 

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