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Q:

# What is a 10-sided figure called?

A:

A 10-sided figure is called a decagon. In geometry, a decagon is defined as a polygon consisting of 10 connecting line segments that connect at 10 vertices. A regular decagon has sides with equal lengths and equal angle measurements.

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The interior angles in a regular decagon each equal 144 degrees in size. The area of a regular decagon is found by multiplying two and a half times the distance between any two parallel sides, then multiplying that number by the length of one side. The perimeter of a regular decagon is found by multiplying 10 times the length of one side. A three-dimensional figure with 10 faces is called a decahedron.

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## Related Questions

• A:

A 10-sided polygon is referred to as a decagon. "Deca" is used as a prefix that means 10, and it is used to create compound words.

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• A:

A three-sided figure can be called a polygon or more specifically, a triangle. All triangles are polygons, but not all polygons are triangles.

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A seven-sided polygon is called a "heptagon." According to MathWorld from Wolfrom Research, Inc., a seven-sided shape is also sometimes called a "septagon." This latter term, however, is not commonly used to describe this shape.