SOLUTION: Find the sum of the measures of the interior angles in a 21-gon. *

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Question 1155380: Find the sum of the measures of the interior angles in a 21-gon. *
Answer by MathLover1(20850) About Me  (Show Source):
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the sum of the measures of the interior angles in polygon is:
180%28n-2%29
if polygon have 21 sides, then
180%2821-2%29=180%2A19=3420