4 pairs
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It has 2 pairs.
The rectangle has four corners.Every corner is a right angle.Every right angle is a place where two perpendicular lines meet.Looks like the rectangle has four pairs of perpendicular sides.
By definition, a parallelogram two separate pairs has parallel sides. The only type of parallelogram that has perpendicular sides is a rectangle. All others have non-perpendicular sides.
A rectangle is a 4 sided quadrilateral having 2 pairs of parallel sides and 4 interior right angles.
It could be a square or a rectangle