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Find the sum of the measures of the interior angles of the indicated convex polygon 21-gon
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Find the sum of the measures of the interior angles of the indicated convex polygon 21-gon

User Bortzmeyer
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sum of all interior angles on a polygon is

180( n - 2) n = number of sides in the polygon.

now, this one is is a 21-gon, thus the sum is 180( 21 - 2).
User Tohasanali
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