Except for rectangles, no parallelogram has right angles.
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rectangle
A rectangle, possibly a square. Can you see why a parallelogram must be a rectangle if any one of its angles is right?
Rectangle and square
a square or a rectangle
Not necessarily. A parallelogram is a quadrilateral with 2 sets of 2 parallel sides. Only rectangles and squares have right angles as all four angles - a rectangle is a "special" parallelogram that has all four angles equal; a square is a "special" rectangle that has all four sides of equal length.