A parallelogram with four right angles is a rectangle. It may also be a square,but not necessarily-- only if the sides are also of equal lengths
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A rectangle or a square: both have four sides and a right-angle of 90 degrees forming the four corners.
A rectangle has four sides whereas a right angle triangle has only three sides.
A rhombus does not have four right angles. A square has four right angles, as does a rectangle.
4/5 of a right angle turn is 72°.
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