no it does not
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.
It doesn't need any in order to be a trapezoid. It can have a max of two pairs of perpendicular sides.
Not usually.
No.
No.
perpendicular
It can, but it need not.
Not usually.
The diagonals of an isosceles trapezoid are equal in lengths but are not perpendicular to each other at right angles.
Yes, an isosceles trapezoid is one example.
A trapezoid has one pair of parallel sides, which are its bases. The other two sides, called the legs, are not parallel and can be either perpendicular or slanted, depending on the specific type of trapezoid. In summary, a trapezoid has one pair of parallel lines and zero perpendicular lines by definition.