Question

2 supplementry angle angle are in ratio of 4;5 find measure

Answer 1

sum of supplementary angles is 180°.
Let 4:5, we write 4x and 5x.

Sum of supplementary angles is 180°.

4x+5x=180°.
9x=180°.
x=180/9=20°.

4x=4×20=80°.
5x=5×20=100°.