Answer:
trapezoid (or trapezium)
Explanation:
You want to know the name of a quadrilateral with one pair of parallel sides.
Trapezoid
The definition of a trapezoid (or trapezium) is that it is a quadrilateral with one pair of parallel sides. The given figure meets the requirements of this definition.
The shape is a trapezoid (trapezium).
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Additional comment
In the US, the shape is called a trapezoid. In the UK, it is called a trapezium. The definitions of these names vary by which side of the pond you are on.
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