A quadrilateral is a parallelogram if it has two pairs of (opposite) sides that are parallel.
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A quadrilateral and a rectangle are the same so.............
4 right angles
A rectangle is defined as "a parallelogram with one right angle" A parallelogram is defined as "a quadrilateral with opposite sides equal and parallel" This makes a rectangle a sort of second-generation quadrilateral!
2 triangles together and a parallelogram is a quadrilateral that has 2 sets of equal sides. ☺
A shape that is a parallelogram but not a quadrilateral doesn't exist.