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An interior angle of a polygon is 100°. What is the exterior angle at that corner?

A80°
B100°
C260°
D10°
Answer & Solution
Correct answer: A. 80°
1. An exterior angle is the supplement of the interior angle. 2. 180° - 100° = 80°. 3. 260° would be 360° - 100°, which is the explement and not the exterior angle here. _Source: Wikipedia, Angle, Polygon-related angles_
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