When the corner angles are right-angles (90 degrees)
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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.