Where attribute must be present for a quadrilateral to also be a trapezoid?

Where attribute must be present for a quadrilateral to also be a trapezoid?
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No. A trapezoid is defined as a quadrilateral with two parallel sides. Therefore, the quality of quadrilateral is necessary, and this condition is satisfied. ... Any other shape can have four sides, but if it does not have (at least) two parallel sides, it cannot be a trapezoid.
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