SOLUTION: What is the sum of the measures of the interior anles of a convex 13-gon?

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Question 130236: What is the sum of the measures of the interior anles of a convex 13-gon?
Answer by ilana(307) About Me  (Show Source):
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There is a formula... the sum of the measures of the interior angles of a convex n-gon is (n-2)180 degrees. For a triangle, n=3, so it's (1)180=180 degrees. For a quadrilateral, it's (4-2)180=(2)180=360 degrees. For a pentagon, it's (5-2)180=(3)180=540 degrees. So plug in n=13 to see the sum of the angle measures for a 13-sided polygon.