Sometimes.
One side can be perpendicular to the two parallel sides, but doesn't have to be.
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No, a trapezium cannot have a right angle. A trapezium is a quadrilateral with at least one pair of parallel sides, but it does not have any restrictions on its angles. A right angle measures 90 degrees, which would imply that the non-parallel sides of the trapezium are perpendicular, making it a different shape altogether, such as a rectangle or a square.
A trapezium has one set of parallel lines and the one of them has the lines of symmetry but the other one doesn't have any. Trapezium doesn't have perpendicular lines
no
no it does not
The question contradicts itself. A dodecagon need not have any perpendicular sides.