A parallelogram does not have to be a rectangle, but since a parallelogram but have 2 sets of parallel sides, it often is. However, rectangles are always parallelograms. I hope this helps, didint exactly understand the question.
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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.
No. Rectangles are parallelograms with all right angles, while parallelograms just have 2 sets of parallel lines.