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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No, a trapezoid does not have a pair of perpendicular lines. A trapezoid is a quadrilateral with at least one pair of parallel sides, but the sides are not required to be perpendicular. Perpendicular lines intersect at a 90-degree angle, which is not a characteristic of a trapezoid.
A right trapezoid has exactly one pair of perpendicular lines and is a quadrilateral.
Can have no pairs or one pair...
a trapezoid has 1 pair of parallel lines and a rectangle has 2 parallel lines
A trapezoid has one pair of parallel sides. They are opposite parallel lines of different lengths.
Yes, they can be. Here is an example to see how this is true. Construct two perpendicular lines AB and CD that intersect at a point O. Let AO = CO, BO = DO and AO ≠ BO, then ABDC forms an isosceles trapezoid. If the lines are not perpendicular, then also ABDC is an isosceles trapezoid and it has perpendicular diagonals.