Question

The sum of 2 interior angles of this triangle is 140°. What is the measure of the third interior angle?


A. 30°

B. 70°

C. 50°

D. 40°

Answer 1

D

Answer 2

The sum of all interior angles of a triangle is 180 degree,a triangle has 3 angles,
so, 180 - 2sides = 40 degrees

Answer 3

suppose,XYZ is a triangle.if x+y=140,then,
x+y+z=180[the sum of all interior angles of a triangle is 180 degrees]
140+z=180[x+y=140]
z=40 degrees.