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Q:

# How many sides does a pentagon have?

A:

A pentagon is a two-dimensional geometric figure that has five sides. A regular pentagon is one where all five sides are the exact same length and the internal angles are all 108 degrees.

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In addition to having five sides, the sides must also form a closed shape. Sides also must be straight. Pentagons can be regular or irregular. An irregular pentagon refers to any pentagon where all sides are not equal, which consequently means that their angles are not equal, either. Other closely related shapes to pentagons include four-sided shapes, quadrilaterals, and six-sided shapes, which are called hexagons.

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## Related Questions

• A:

A regular pentagon has five lines of symmetry. An irregular pentagon, with non-equal side lengths and internal angles, may or may not have any lines of symmetry.

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• A:

Three triangles can be drawn inside a regular pentagon. If the diagonals are drawn from any one vertex of the pentagon, the number of triangles formed is given by the formula n - 2, where “n” is the number of sides of the polygon.

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• A:

A pentagon has five vertices. In geometry, a vertex is the point of meeting of two or more straight lines. The term "vertex" comes from Latin and has the plural "vertices."