High Quality Content by WIKIPEDIA articles! In geometry, an equilateral polygon is a polygon which has all sides of the same length. For instance, an equilateral triangle is a triangle of equal edge lengths. All equilateral triangles are similar to each other, and have 60 degree internal angles. An equilateral quadrilateral is a rhombus, which includes the square as a special case.An equilateral polygon which is cyclic (its vertices are on a circle) is a regular polygon. All equilateral quadrilaterals are convex, but there exist equilateral polygons with five sides (pentagons) which are concave, and similarly for every larger number of sides.

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