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# What is a five-sided shape called?

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A five-sided shape is called a pentagon. In geometry, all two dimensional shapes are known as polygons, so it can also be referred to as a five-sided polygon.

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There are two types of pentagon; regular and irregular. A regular pentagon has five sides of equal length.

An irregular pentagon has five sides of varying length. A regular pentagon will always have the same interior and exterior angles. The interior angle of a regular pentagon is 108 degrees and the exterior angle of a regular pentagon is 72 degrees. The total interior angles of a pentagon will always equal 540 degrees.

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## Related Questions

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A pentagon is the name for a five-sided polygon. However, there are different types of five-sided polygons, such as irregular, regular, concave and convex pentagons.

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A 12-sided polygon is called a dodecagon. A polygon is any closed figure with 3 or more sides and angles. Every polygon with 3 to 20 sides has a name. Polygons with 30, 40, 50, 60, 70, 80, 90, and 100 sides have specific names as well.

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A nine-sided polygon is called a nonagon. Another name for a nine-sided polygon is enneagon. The general accepted names are "n-gon" where n is the number of the sides of the polygon.

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A six-sided shape is called a hexagon as long as all six sides are straight lines and the lines connect to make one closed shape. If it does not close or has curved lines, there is no generic name for the shape.