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

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

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

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