There are many shapes with parallel sides: e.g. most regular quadrilaterals like Squares, Rectangles and Parallelograms have parallel sides, and so do quite a few regular polygon.
But what is a parallel side (or line)? These are two line which are exactly the same length apart and must always be straight and consequently will never meet, no matter how far they extend. For example, train tracks are often parallel (until they bend for the train to turn left or right). They would have to be parallel, because the distance between the train's wheels is always going to be the same.
Many shapes have "sets" of parallel sides, like a rectangle has two sets and a hexagon has six.
Sets of Parallel lines (or sides) are distinguished by an arrow pointing in one direction of both lines.
Note: Irregular polygons with 5 or more sides are also candidates.
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If two sides are parallel and the other two aren't, the shape is a trapezoid.
A rectangle is a shape that has four sides with two parallel lines.
A parallelogram is an quadrilateral (a figure with four edges and four vertices) with two sets of parallel sides. A trapezoid, also known as a trapezium, is a shape with four sides with a pair of parallel sides.
A trapezoid has exactly one pair of parallel sides
The four sided shape that has two parallel lines is called a trapezoid. A parallelogram is a four sided shape that has two pairs of parallel lines.