A trapezoid can have up to two right, 90 degree angles for it still to be classified as a trapezoid.
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A right trapezoid has at least two right angles.
At most two.
A trapezoid may have two right angles.
A trapezoid may have no right angles, or it may have two adjacent ones.
There is one pair of parallel sides. A trapezoid can have at most one right angle. Not all trapezoids have right angles.