They are all 4 sided quadrilaterals having 4 interior angles that add up to 360 degrees.
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A square, a rectangle and a parallelogram are all 4 sided quadrilaterals.
A square has all the properties of a rectangle and rhombus. (A square is always a rectangle.) A rectangle is not always a square but is always a parallelogram. A parallelogram is a quadrilateral (four sided figure) with both pairs of opposite sides are parallel. A rectangle is a quadrilateral with four right angles.
A rectangle is a parallelogram, but a parallelogram is not necessarily a rectangle. This is because a parallelogram can be so many other things, like a rhombus or a square.
A square is a parallelogram a parallelogram isn't always a square. The definition of parallelogram is a closed shape with two parallel sides. So a rectangle is a parallelogram and so is a square and a rombus. The definition of square is shape with four equal sides.
A quadrilateral.