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Sum of interior angles

Find the sum of the interior angle of:pentagon,15-gon,and 18-gon.

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In general the sum of the interior angle of a closed shape with m sides (a "m-gon") is equal to 180*(m-2). Because by drawing lines from a corner to all the non-adjacent corners we can draw exactly (m-2) triangles inside the "m-gon", such that the total sum of the sum of interior angles of all triangles will ...

Solution Summary

This shows how to find the sum of interior angles of various polygons.

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