Which of the following is true?

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

Correct Answer: A
, , Explanation/Reference: 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
.

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