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Home > GC > Chapter 12 > Lesson 12.2.3 > Problem 12-80

12-80.

If the sum of the interior angles of a regular polygon is 2160°, how many sides must it have? Homework Help ✎

According to the formula for the sum of the interior angles of an n-gon, 180°(n - 2) = 2160°.

The polygon has 14 sides.