Question: The exterior angle of a triangle is 120°. One of the opposite interior angles is 50°. What is the measure of the other interior angle?
A) 40°
B) 50°
C) 60°
D) 70°
Solution:
The sum of an exterior angle and its adjacent interior angle is 180°:
Adjacent angle=180°−120°=60°
The sum of the two opposite interior angles is equal to the exterior angle:
Other angle=120°−50°=70°
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