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
.
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