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No, but all are roughly square or rectangular. The classification "parallelogram" means that there are four sides and opposite sides are parallel. Only for SQUARES and RECTANGLES are there 4 right angles (90 degrees) such that adjacent sides are perpendicular.

The other parallelograms do not have any right angles: the RHOMBUS and the RHOMBOID. The rhombus (diamond shape, tilted square) has four sides of equal length, while the rhomboid (stretched diamond) has opposite sides of equal length and parallel, but the two sets of opposite sides have different lengths, e.g. as in the faces of rhomboid parallelpipeds.

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Q: Can all parallelograms be called rectangles?
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