I have been thinking about an question, and can't find the answer.  Is there anyone who might know?  I am trying to determine WHY the formula (n-2)(180) works for finding sum of interior angles of regular polygons.  Is it because 1 line is a straight line with 180 degrees, and then adding additional lines add 180 degrees, hence a triangle with 3 sides is (3-2)(180)?


Carol McNair
Team Sequoia
Camels Hump Middle School
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