Every parallelogram has 4 sides.
If it has 4 right angles, then it's a rectangle.
(Actually, a parallelogram with one right angle must be a rectangle.)
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Both a square and a rectangle are parallelograms with 4 right angles
A square or a rectangle both have 4 sides and 4 interior right angles
A square has 4 equal sides with 4 right angles.
It is a square that has 4 equal sides and 4 right angles.
A square has 4 equal sides and 4 right angles.