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In general, trapezoids do not have right angles. In fact, a trapezoid with a right angle is a special case, called a rectangle.
Each angle of a rectangle is a right angle. (90°)
Except for the special case of a rectangle, a parallelogram must have two acute angles.
A square is a special rectangle.
A rectangle is defined as "a parallelogram with one right angle" A parallelogram is defined as "a quadrilateral with opposite sides equal and parallel" This makes a rectangle a sort of second-generation quadrilateral!