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Interior angles

What is the sum of the interior angles of a polygon with 9 sides?

Draw a figure like the one you are investigating. Put a dot in the middle. Draw lines from the dot to each of the corners. You now have 9 triangles. How many degrees are contained in one triangle? How many degrees are acounted for at the apex of the 9 triangles?
27 November 2011
divide 360 by nine and then minus that number from 180 if we are talking about a regular polygon
28 November 2011
9-2 = 7. 7 * 180 = 1260 degrees is your answer.
29 November 2011
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