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Mathematics 9 Online
OpenStudy (anonymous):

Fins the sum of the interior angles of the following. 1.heptagon 2.nonagon please explain

OpenStudy (anonymous):

nonagon is nine-sided, right?

OpenStudy (mathteacher1729):

This page has the best explanation of it. http://www.mathsisfun.com/geometry/interior-angles-polygons.html Lots of awesome pictures. :)

OpenStudy (anonymous):

yes its 9

OpenStudy (anonymous):

Be careful!....it is (number of sides-2) times 180....

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