A perfect square
Four 90 degree angles and four equal sides
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square
A square is a plane geometric figure having 4 equal sides and 4 right angles.
A regular polygon is a plane figure with equal sides and equal angles.
A regular polygon (a closed plane figure of straight lines) has all equal angles and all equal side lengths. For example, a square is a regular quadrilateral, because it's four edges are all the same length, and it's angles are all equal (90 degrees). A regular triangle is an equilateral triangle.An irregular polygon does not have equal sides and angles. N.B to be regular, a polygon must have both equal sides and equal angles. If a polygon has equal sides but unequal angles it is not a regular polygon.
A hexagon has six sides and six angles.