trapozoid
square
parallelogram
A square.
That is a mathematical impossibility. At least 2 angles have to be congruent in order for the shape to have 4 sides.
rectangle
a rectangle
trapozoid
square
parallelogram
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Rhombus
A square.
Square
rectangle
Rhombus?
A square has 4 right angles and 4 equal sides.Its relatives, the rhombus (has 4 equal sides, but not necessarily 4 right angles), the rectangle (4 right angles, but not necessarily 4 equal sides) are the closest as far as quadrilaterals are concerned.