Question

What is the value of n ?

Answer 1

The angles 131°; 160° and n° are the exterior angles of the triangle.

The sum of measure of an exterior angles of the triangle is equal 360°.

Therefore we have the equation:

`131^o+160^o+n^o=360^o\\\\291^o+n^o=360^o\ \ \ \ |-291^o\\\\n^o=69^o`

Answer: A. 69°