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All of them, except rectangles. (Rectangles are special parallelograms.)
yes. rectangles are just the special cases of parallelograms where the angles are all 900
No. Only some parallelograms are rectangles. But all rectangles are parallelograms.
All rectangles are parallelograms, so yes there are some.
Some parallelograms are rectangles; all rectangles are parallelograms.