Pentagon
Shape with five sides / From Wikipedia, the free encyclopedia
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This article is about the geometric figure. For the headquarters of the United States Department of Defense, see The Pentagon. For other uses, see Pentagon (disambiguation).
In geometry, a pentagon (from Greek πέντε (pente) 'five', and γωνία (gonia) 'angle'[1]) is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°.
A pentagon may be simple or self-intersecting. A self-intersecting regular pentagon (or star pentagon) is called a pentagram.