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I guess you mean with ALL sides the same size it's an equilateral triangle
the equilateral triangle
An equilateral triangle.
An equilateral is a polygon whose sides are all of equal length, most commonly used to refer to an equilateral triangle.
The terms equiangular means a polygon having the same angle between any two adjacent sides. Equilateral means all sides of equal length. A polygon can be equilateral without being equiangular (the rhombus) and equiangular without being equilateral (the rectangle). If a polygon is both equilateral and equiangular, it is a "regular polygon" such as the pentagon, square, and equilateral triangle.