Rectangle, possibly a square.
Definition of rectangle is "parallelogram with one right angle". Think about that and you'll realise that all angles thus have to be right.
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A parallelogram is a four sided polygon with opposing parallel sides of equal length. Then if it has four right angles, the polygon becomes a rectangle.
Square
A parallelogram with 4 equal right angles is a rectangle.
Depends on your question. A rectangle is a parallelogram and has 4 right angles. BUT A parallelogram can have only a total of one, two, or four right angles. Mathematically, 3 right angles is 270 degrees. A parallelogram has 360 degrees. 360 - 270 = 90 degrees = right angle.
a parallelogram with four right angles with sides different in length and width is That would be a rectangle. - HistoryDork