Question

if one of the exterior angles of a triangle is 120 degree and one of its interior opposite angle is 80 degree then other interior opposite angle is equal to​

Answer 1

Answer:

sum of two opposite int. angle = 1 ext. angle

it's proved ....

Step-by-step explanation:

9. 120-80 =60·

Answer 2

Answer:

as we know that exterior angle = sum of two interior opposite angles

exterior angle=120°

one of interior opposite angle=80°

another interior opposite angle be 'x'

120°=x+80°

x=120°- 80°

x=40°

another interior opposite angle=40°