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Middle/High School Algebra, Geometry, and Statistics (AGS)
6.18 Theorem: Sum of the Interior Angles of a Convex Polygon

Sum of the interior angles of a polygon is (n - 2) 180 or (2n - 4) 90
where n is the number of sides of a polygon

Note: The sum of the interior angles of a convex polygon is (2n-4) 90 or (n-2)180.

Using the above formula, draw and find the sum of the interior angles for the following figures: triangle, rectangle, square, rectangle, parallelogram, pentagon, hexagon, heptagon, octagon, nonagon and decagon.

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