A parallelogram with a right angle is a rectangle.
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A trapezoid is a quadrilateral which must have one pair of parallel sides. If the other pair of sides is also parallel then it is a parallelogram.
Because it is a regular 4 sided quadrilateral having 4 equal sides and 4 equal interior right angles
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A rectangle is a special form of parallelogram that has adjacent sides perpendicular to each other or all the inside angles are 90 degrees.
A trapezoid is a four-sided figure with two opposite sides parallel. A rectangle (and also a parallelogram) is a trapezoid but BOTH pairs of opposite sides are parallel.