Based on the diagram above, which of the following is true?

A . i = e + f
B . g + i = h + e
C . e + i = e + h
D . e + g + i = 180
E . e + f + g + h + i = 360

Answer: A

Explanation:

The measure of an exterior angle of a triangle is equal to the sum of the two interior angles of the triangle to which the exterior angle is NOT supplementary.

is supplementary to

, so the sum of the interior

and

is

equal to the measure of

.