Question

if two supplementary angles are in the ratio 2:7 then find angle

Answer 1

2x+7x=180°
x=180/9=20°
2×20°=40°
7×20°=140°
May this had helped you

Answer 2

let 1st angle be 2x deg.
then 2nd angle be 7x deg.

now,as we know
sum of supplementary angles is 180
so, 2x+7x=180
9x=180
x =180/9
then x=20

therefore 1st angle is 2x
= 2×20=40deg.
same 2nd angle is 7x
=7×20=140deg.