A3 sided regular polygon is called

equilateral is a 3 sided regular polygon.

A three sided regular polygon would be called an equilateral. Equilaterals have three or more sides, which all are of the same length. And if we break down the word equilateral, we will have the root word "equal" which means the same, and "Lateral", which means from the sides. So, equilateral basically means "equal from the sides. An example of an equilateral would be a square because it has three or more sides and all sides are equal of length.

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