In fact, some are rectangles, but not all are.
All rectangles are parallelograms, so yes there are some.
No. Only some parallelograms are rectangles. But all rectangles are parallelograms.
Some parallelograms are rectangles; all rectangles are parallelograms.
false
True
Yes.
Some of them (rectangles) do.
yes, it is true
Yes
yes
yes. rectangles are just the special cases of parallelograms where the angles are all 900