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# Special pairs of angles

Two angles are complementary to each other if they add upto 90°.

Special pairs of angles

Two angles are complementary to each other if they add upto 90° [See Fig. 4.28(i)] Two angles are supplementary to each other if they add upto 180° [See Fig. 4.28(ii)]

In the above figures, 20° and 70° are complementary angles and 147° and 33° are supplementary angles. But 35° and 75° are neither complementary nor supplementary.

ICT Corner

GEOMETRY

Expected Result is shown in this picture

Step – 1

Open the Browser and copy and paste the Link given below (or) by typing the URL given (or) Scan the QR Code.

Step − 2

GeoGebra Work Book called “Measuring Angles Using Protractor” will appear. An angle and a Protractor will appear.

Step-3

Drag the protractor and place it on the angle and measure it. Now Click on the “Answer” Box to check whether your measurement is correct. Click on “Random” button to create new angle and continue till you understand how to measure the angle.