A parallelogram is any four-sided shape where each side is parallel to the one across from it. A rectangle is a special case of a parallelogram where all the vertices are right angles.
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parallelograms, and rectangles (parallelograms)
No. Only some parallelograms are rectangles. But all rectangles are parallelograms.
Some parallelograms are rectangles; all rectangles are parallelograms.
All rectangles are parallelograms, so yes there are some.
Yes. All rectangles are also parallelograms, but not all parallelograms are rectangles.