It is because parallelograms are in definition, is a quadrilateral with two pairs of parallel sides. So that means the angles don't have to be 90 degrees like the rectangle has to; as long as two pairs of sides are parallel and is a quadrilateral, it is a parallelogram.
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All rectangles are parallelograms, so yes there are some.
No. Only some parallelograms are rectangles. But all rectangles are parallelograms.
Some parallelograms are rectangles; all rectangles are parallelograms.
yes, it is true
Yes