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Geometry 12 Online
OpenStudy (anonymous):

A pentagon with one interior angle that measures 200o is a ___________ polygon. A)concave B)convex C)regular D)none of the above

Directrix (directrix):

Look for this heading "Concave or Convex" and read several line of text and you will know. http://www.mathsisfun.com/geometry/polygons.html @caliallmon

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