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# What is a regular shape in math?

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A regular shape, also known as a regular polygon, is a shape that has sides that are all equal. If there are sides of differing lengths, these shapes are known as irregular polygons.

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As well as having all sides equal in length, all interior angles must also be the same. For example, a triangle with three sides of equal length and all three internal angles of 60 degrees, which is also known as an equilateral triangle. However, not all regular shapes are equilateral because while an equilateral polygon can have all sides exactly the same length, they must also have the same internal angles.

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## Related Questions

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Based on the geometric definition of a polygon, a circle has no sides or infinite sides. According to the definition, a circle cannot have sides because it isn't made up of line segments that are connected by shared endpoints that form interior angles.

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A polygon with four sides and four angles is called a quadrilateral. Quadrilaterals are two-dimensional, closed shapes with angle measurements that add up to 360 degrees.

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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.