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Q:

# What shape has 10 sides?

A:

A shape that has 10 sides is call a decagon. A decagon is a type of polygon, which is a two dimensional shape with straight lines. These lines connect to each other to form a closed shape.

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There are several types of decagons. An equilateral decagon is a decagon with equal length sides while an equiangular decagon has equal angles. A regular decagon has equal angles of 144 degrees each and sides of the same length. If the sides or angles are not equal, then the decagon is irregular. If none of the internal angles are greater than 180 degrees, then it is a convex decagon. If at least one angle is greater than 180 degrees, then the decagon is convex.

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## Related Questions

• A:

A dodecagon is a two-dimensional shape with 12 sides. A regular-shaped dodecagon has all its sides with the same length, and all internal angles are the same size. An irregular-shaped dodecagon has sides and angles of different sizes.

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• A:

A shape that has seven sides is a heptagon. Heptagons can be either irregular or regular polygons. However, in a regular heptagon, all side lengths and interior angles are also equal. There also are 14 diagonals in this polygon.

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• A:

In geometry, a shape with five sides is called a pentagon. A regular pentagon has five sides of equal length, as well as five equal angles. A standard "STOP" sign in the US is a regular pentagon, as is the Pentagon building in the District of Columbia.