A square or rectangle has two sets of parallel lines. Stop signs technically have 4 short sets o parallel lines. Hexagon could have 3 sets, etc. All of which are polygons, though not all polygons have parallel lines.
Trapezoid
a rectangle is a shape that has two sets of parallel lines a trapezoid only has to have one set of parallel lines
Trapezium.
A trapezoid has two parallel lines.
Any shape that contains a section of a plane can have an infinite number of parallel lines in it.
Trapezoid
A square
a rectangle is a shape that has two sets of parallel lines a trapezoid only has to have one set of parallel lines
Trapezium.
A trapezoid has two parallel lines.
A rhombus has parallel lines but no perpendicular lines.
Any shape that contains a section of a plane can have an infinite number of parallel lines in it.
A parallelogram has 1 pair of parallel lines that is also regular. See the related link.
Triangles, Circles, Ellipses Only triangle if you only want polygons.
A triangle, as it only has three lines and the only two that are possible touch at the top.
A shape with only one set of parallel lines is a trapezoid (or trapezium in some regions). In this quadrilateral, one pair of opposite sides are parallel while the other pair is not. This unique characteristic distinguishes it from other quadrilaterals, such as rectangles or squares, which have two sets of parallel sides.
A shape with 4 straight lines in which there are 2 parallel and 2 unparallel lines is called a Trapezium.