false it is not
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yes
Every parallelogram has. (That includes every rhombus, rectangle, and square.)
a parallelogram is defined as any quadrilateral (four sided object) with oposite sides being parallel. So yes every square is a parallelogram but every parallelogram is not a square.
A square is a quadrilateral, but not all quadrilaterals are squares. A quadrilateral is just a four-sided figure.
Yes. A square is a rectangle and a rectangle is a quadrilateral.