its called a square, or another shape; diamond
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a polygon with 4 right angles and 4 sides of the same length
A convex polygon with congruent sides and congruent angles is a regular polygon.Some regular pilgrims have specific names: Equilateral triangle and square
any regular polygon
Not all polygons are regular by definition. An irregular polygon may have non-congruent sides or non congruent angles or both. A regular polygon will always have both congruent sides and angles.
Any polygon can have, and every regular polygon has.