Two interior angles of a triangle have mesures of 45 and 75 degrees. Which of the following could not be a measure of an exterior angle of a triangle?
A). 105 degreesB). 110 degreesC).120 degreesD). 135 degrees

Question

anonymous · Answer

Hmm 
45+A=180
75+B=180

Where A and B are exterior angle.
Interior plus the interior will be 180

anonymous · Answer

BTW you have to find the other interior angle and then find it's exterior angle.

anonymous · Answer

So you will have three exterior angles that are right and one that is wrong from the answers that are given to you.

anonymous · Answer

I got B, is that correct?

anonymous · Answer

yes