because that is how rectangles are defined. that's like asking why are all circles round
-_-;;
because the opposite sides are congruent (same).
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No. Only some parallelograms are rectangles. But all rectangles are parallelograms.
Yes. All rectangles are also parallelograms, but not all parallelograms are rectangles.
All rectangles are parallelograms, so yes there are some.
Some parallelograms are rectangles; all rectangles are parallelograms.
No. Rectangles are parallelograms with all right angles, while parallelograms just have 2 sets of parallel lines.