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trapezoid
It could be a trapezoid
A trapezoid is a quadrilateral that has one pair of parallel sides. Since a right angle is formed by two perpendicular lines, it would mean that one of the non-parallel sides would have to be perpendicular to one of the parallel sides, which violates the definition of a trapezoid. Therefore, a trapezoid cannot have a right angle.
Since a trapezoid is a quadrilateral whose bases are parallel and not congruent, then one of its sides can be perpendicular to its bases (as the shortest distance between two parallel lines). Such a trapezoid is called a right trapezoid.
trapezoid