Q4 of 23 Page 87

Find the angles in each of the following.

Supplementary angles are in the ratio 4:5.

Let the supplementary angles be 4x and 5x


We know that two angles are said to be supple mentary if their sum is 180°.


⇒ 4x + 5x = 180°


⇒ 9x = 180°


⇒ x = 20°


So, the supplementary angles will be 4× 20° = 80° and 5× 20° = 100°


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