Q:

# How many lines of symmetry does a pentagon have?

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 line of symmetry is a line in a two-dimensional shape where the remnants on both sides are exact mirrored versions of each other. A line of symmetry in a regular pentagon must go from the center of any side to the vertex directly opposite to it. Because a regular pentagon has five sides, it also has five lines of symmetry. Most regular polygons have a number of lines of symmetry that are equal to the number of its sides.

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## Related Questions

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A regular heptagon has seven lines of symmetry. Each one runs from a vertex to the opposite side, bisecting the side at a 90-degree angle.

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Some shapes that have no lines of symmetry include the scalene triangle and trapezium. A trapezium is a four-sided flat shape with straight sides, none of which are parallel. Outside of the United States, the trapezium is called the general irregular quadrilateral.

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An equilateral triangle has three lines of symmetry. There are three sides of equal length in an equilateral triangle. A line of symmetry is a line such that if a mirror is placed along it, its reflection appears identical to the area behind the mirror.