A trapezium or parallelogram. A pentagon can have a pair of parallel sides. Polygons with 6 or more sides can have two (or more) pairs of parallel sides.
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If it has four equal sides, then two parallel sides implies two PAIRS of parallel sides. The shape is a rhombus.
A shape with four or more sides can have two parallel sides.
A trapezoid has two parallel sides.
If the shape (a quadrilateral) has only 2 parallel sides, it is a trapezoid (UK trapezium).A shape with four sides and two sets of parallel sides is a parallelogram (rectangle, square, rhomboid, rhombus) because these figures have four sides and two sets of parallel sides.
A shape with parallel sides but no right angles is called a parallelogram