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# What is the name of a 12-sided polygon?

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The accepted name of a 12-sided polygon is "dodecagon." A polygon is a two-dimensional shape consisting of angles and straight lines in a closed system. The word "polygon" comes from the Greek "poly," which means "many" and "gon," which means "sides."

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A dodecagon, like all polygons, is made up of of several parts:

• Straight line segments called sides.
• Several vertices, where the points of two sides meet. A dodecagon has 12 vertices.
• Diagonals, which are lines connecting two vertices, but are not sides.
• Interior angles formed inside by two adjacent sides.
• Exterior angles formed outside by adjacent sides.

The number of diagonals in a polygon can be calculated by the formula 1/2N(N-3), where N is the number of sides. In a dodecagon, the number of diagonals is equal to 1/2(12(12-3), or 54. The sum of all interior angles of a polygon can be calculated by subtracting 2 from the number of sides and multiplying by 180 degrees. The sum of a dodecagon is 1800 degrees.

Polygons that have equal sides and angles are called regular polygons. A regular dodecagon has angles that are 150 degrees each (1800/12). Equiangular polygons have angles that are equal nut not sides. Conversely, equilateral polygons have sides that are equal but not angles.

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## Related Questions

• 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."

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• A:

The dodecagon is the name of a 12-sided shape. This polygon also has 12 interior angles and 12 vertices. The sum of the interior angles of the dodecagon is 1,800 degrees.

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• A:

The polygon with 1,000 sides, 1,000 vertices and 1,000 angles is called a chiliagon or a 1,000-gon. The term "chiliagon," with a Greek-derived prefix meaning “thousand,” is a proposed name for the 1,000-sided, two-dimensional shape, but it is seldom used.