Question

9. Two adjacent angles on a straight line are in the ratio 5: 4. Find the
measure of each one of these angles.​

Answer 1

Let first angle = 5x

Second angle = 4x

we know that,

The sum of straight angle is 180°.

A.T.Q.

5x + 4x = 180°

9x = 180°

x = 180°/9

x = 20

First angle = 5x = 5 × 20 = 100

Second angle = 4x = 4 × 20 = 80