A rectangle has 4 equal, 90 degree angles (one at each corner). A parallelogram may not have all equal angles. Imagine a rectangle that whose opposite corners were pulled so that it had two slanted, but parallel sides, and two straight and parallel sides. That is what some parallelograms look like. A rectangle, however, is a type of parallelogram. You can see a picture of a non-rectangular parallelogram, by clicking on the related link.
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No. Only some parallelograms are rectangles. But all rectangles are parallelograms.
All rectangles are parallelograms, so yes there are some.
Some parallelograms are rectangles; all rectangles are parallelograms.
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.