A quadrilateral with only one pair of opposite sides parallel is ___________.
A quadrilateral in which a pair of opposite sides is parallel is a trapezium.
The trapezium is a quadrilateral with one pair of parallel opposite sides. The parallel sides of a trapezium are called bases and the non-parallel sides of a trapezium are called legs. It is also called a trapezoid. Sometimes the parallelogram is also called a trapezoid with two parallel sides.
Properties of Trapezium
For example, The given quadrilateral is a trapezium in which
Hence, A quadrilateral with only one pair of opposite sides parallel is a trapezium.