quadrilateral
A geometric shape with 4 sides and 4 vertices is a 4-sided figure, a quadrilateral.
It is a 4 sided quadrilateral
A square.
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.
A 4 sided figure in which opposite sides are parallel.
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Trapezoid
a group of 4 sided shapes is called a quidrilatriel
it is the square
A parallelogram is a 4-sided figure in which both sets of opposing sides are parallel and of equal length. A trapezoid is a 4 sided figure in which only one set of opposing sides is parallel and those sides are not in lenght.