Answer:
B) 108°
Explanation:
You want the interior angle measure for a regular pentagon.
Interior angles
The interior angles of a regular n-gon will have measure ...
180° -360°/n
When n = 5, the interior angles have measure ...
180° -360*/5 = 180° -72° = 108°
The interior angles of a regular pentagon are 108°.
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Additional comment
The 360°/n comes from the fact that the sum of exterior angles for any convex polygon is 360°. For a regular n-gon, those exterior angles are congruent, so each is 360°/n. The interior angle is its supplement.
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