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# What is a polygon called where all sides are congruent?

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A polygon that has all sides congruent is called a "regular polygon." Regular polygons must also have all angles congruent, which is a side effect of having congruent sides. For instance, a square must always have four 90-degree angles because of its four congruent sides.

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A regular polygon may have any number of sides, as long as its sides and angles are all congruent. Common examples include five-sided pentagons, six-sided hexagons, seven-sided heptagons, eight-sided octagons and nine-sided nonagons. It is possible for any of these polygons to be irregular if they have the same number of sides but in different sizes.

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## Related Questions

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A 20-sided polygon is called an icosagon. Along with having 20 sides, all icosagons have 20 interior angles that add up to a total of 3240 degrees.

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A parallelogram with all sides congruent is called a rhombus. All the sides of a rhombus are equal in length, which is why it is also called an equilateral quadrilateral. Other names commonly used to refer to a rhombus are "lozenge" and "diamond."

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A polygon with seven sides is called a heptagon. A polygon is a closed geometric shape that has at least three sides and angles.