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Redandwhite · Answer 1 · 2017-12-30T14:51:20+0000

Sum of angles in polygon is 180*(n - 2), where n = number of sides.

180(n - 2) = 2160

n - 2 = 2160/180

n - 2 = 12

n = 12 + 2

n = 14

The polygon has 14 sides. It is a tetradecagon

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