A pentagon is a five-sided polygon. Several special types of pentagons are illustrated above. In particular, a pentagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular pentagon.

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Decagon, Hexagon, Octagon, Polygon, Regular Pentagon Explore this topic in the MathWorld classroom

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Weisstein, Eric W. "Pentagon." From MathWorld--A Wolfram Web Resource.

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