You can put this solution on YOUR website! I hope you need this:
Find the measure of the exterior angle shown; interior angles are and , and exterior angle is
Here is the theorem for exterior angles, and we will use it in order to solve this problem:
Exterior Angle Theorem
The measure of an exterior angle of a triangle
is equal to the sum of the measures of the
two nonadjacent interior angles.
so, in your case will be:
....move to the left, and to the right
....
