Question

One of the interior opposite angles of a triangle is 40degree if the measure of the exterior angle is 120degree find the measure of the other two angles of the triangle

Answer 1

hey set your answer is here..
120° =40° +x
so
x=80°

now third angle of triangle=180-120=60°

so angles are 40,60,80

Answer 2

Exterior angle = sum of opposite interior angles

Let the other opposite interior angle be x.

120 = 40 + x

x = 120 - 40

x = 80°

Sum of all angles in a triangle is 180°

Let the other angle in the triangle be y

40 + 80 + y = 180

120 + y = 180

y = 180 - 120

y = 60°

Answer: The other 2 angles are 80° and 60°