How do you draw a quadrangle with 1 pair of parallel sides?

A quadrangle is an open space with buildings on 4 sides.

A quadrilateral is a four-sided shape. A quadrilateral that is not a parallelogram (two sets of parallel sides) may be a trapezoid or a trapezium (US terms). To draw a trapezium (irregular quadrilateral), draw two parallel lines and connect them with unequal lines at non-congruent angles. If you make the angles opposite and congruent, you have drawn a trapezoid, which looks like a small stepstool with a top smaller than the base.