It doesn't need any in order to be a trapezoid. It can have a max of two pairs of perpendicular sides.
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The only requirement for a trapezoid is that one pair of opposite sides be parallel. There could be trapezoids with a pair of perpendicular lines.
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A right trapezoid has exactly one pair of perpendicular lines and is a quadrilateral.
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This is a trapezoid (or trapezum, depending on what country you live in).