Question

one of the exterior angle of a angle is 80* and its the intervior opposite angles are in the ratio of 5:3 .find its angle

Answer 1

in triangle
let us take 5:3as 5x,3,
we know
exterior angle =sum of two interior opposite angles
80*=5x+3x
80=8x
$x = 80 \div 8$

x=10
then interior angles ,
5x=5×10=50
3x=3×10=30
hope this will help u

Answer 2

let angles be 5x and 3x as they r in the ratio...

ATQ
5x +3x = 80
8x = 80
x = 10

so....
first angle = 5x= 50°
second angle = 3x = 30°