a polygon
quadrilateral
A geometric shape with 4 sides and 4 vertices is a 4-sided figure, a quadrilateral.
A square.
It is a 4 sided quadrilateral
I assume you mean 4 congruent sides or 2 pairs of congruent sides.. (There are no 4-sided figures with 8 sides.) A square.
A quadrilateral is a 4 sided figure the has no curves and has strait sides.
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A 4 sided figure in which opposite sides are parallel.
Trapezoid
a group of 4 sided shapes is called a quidrilatriel
it is the square
quadrilateral