an octagon it has eight sides
trapezoid
A parallelogram always has one set of parallel lines, plus another set also.A trapezoid (trapezium) always has exactly one set of parallel lines and no more.Any shape with more than four sides can have one set of parallel lines, but doesn'tnecessarily have to.
A geometric shape with only one set of parallel sides is a trapezoid.
A trapezoid perhaps?
A right trapezium.
A trapezium. It has one set of parallel sides. It has four sides.
A shape that has all parallel sides, like a square, rectangle, or a rhombus. A trapazoid wouldn't be one because only one set of lines are parallel.
The description given fits that of a trapezoid
trapezium
A general trapezium, and selected versions of polygons with 5 or more sides.
Trapezoid