A quadrilateral with one pair of parallel lines would be a trapezoid. : P
It can be but it need not be.
trapezoid
2
1
A trapezoid
A quadrilateral. It may be a rectangle, parallelogram, trapezoid, or an irregular quadrilateral.
a rectangle. It wouldn't be a square because that has 1 pair of 4 equal side but a rectangle has 2 pairs of equal sides and 4 right angles.
a trapezoid that is NOT isosceles
A trapezoid.
square
always