How can we call a parallelogram a trapezium but a trapezium not a parallelogram? Plz answer as quickly as possible........
A trapezium is a quadrilateral with one pair of opposite sides parallel.
A parallelogram is a quadrilateral with two pairs of opposite sides parallel.
A parallelogram can be called a trapezium as a parallelogram has at least one pair of parallel sides whereas, a trapezium can be called a parallelogram as it does not have two pairs of parallel sides.