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Mathematics 11 Online
OpenStudy (anonymous):

Is the sum of the interior angles of a convex polygon the same as a non-convex (concave) polygon?

Directrix (directrix):

Yes. Sum of Interior Angles The interior angles of any polygon always add up to a constant value, which depends only on the number of sides. For example the interior angles of a pentagon always add up to 540° no matter if it regular or irregular, convex or concave, or what size and shape it is. (I was unsure on that myself - glad you asked.) http://www.mathopenref.com/polygoninteriorangles.html

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