Credit: Alex Bateman CC-BY-SA 2.0
Q:

# How many sides does a decagon have?

A:

A decagon is a polygon that has 10 sides. Decagons can be both regular polygons, which have sides of equal length and equal interior angles between each side, or irregular polygons, which have unequal sides and angles between sides.

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All the interior angles of a regular decagon add up to 1,440 degrees. The formula to find the value of an interior angle of a regular polygon is (180n-360)/n, with n being the number of sides. Using 10 as n, this formula shows that a regular decagon has interior angles of 144 degrees, making the exterior angles measure 36 degrees each.

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## Related Questions

• A:

A polygon with five sides is called a pentagon. In Greek, "pente" means "five." When math textbooks discuss pentagons, they are typically referring to a polygon with five equal sides, otherwise known as a regular pentagon.

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• A:

A five-sided polygon is called a pentagon. A pentagon also has five vertices and five interior angles, which add up to a total of 540 degrees.

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• A:

The name of a 10-sided polygon is a decagon. The term "decagon" comes from the modern Latin word "decagonum" and from the Greek "dekagonon," which is a combination of "deka," meaning "ten" and "gonia," meaning "corner" or "angle."