Question

Suppose a triangle has interior angle measures of 50,60, and 70. Which of the following is not an exterior angle measure?

A. 100

B. 110

C. 120

D. 130

Answer 1

A. 100

step by step calculation

exterior angle plus interior angle add up to 180 degrees

hence:

180-70=110

180-60=120

180-50=130

therefore 100 is not an exterior angle of that triangle