A 5sided polygon is called a. pentagon.
http://wiki.answers.com/Q/What_is_a_5_sided_polygo...

A seven sided polygon is most commonly referred to as a heptagon. Being a heptagon means that there has to be seven sides, not six or ten!
http://www.ask.com/webanswers/Science/Mathematics...

A polygon with five sides is called a pentagon. ChaCha on!
http://www.chacha.com/question/whatisapolygonw...

Sides Name. n Ngon. 3 Triangle. 4 Quadrilateral. 5 Pentagon. 6 Hexagon. 7 Heptagon. 8 Octagon. 10 Decagon. 12 Dodecagon.
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