A parallelogram. (A rectangle if the angles are 90o)
A parallelogram (which may also be a rectangle, if all four angles are equal to 90°)
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Every 4-sided polygon in which the opposite sides are parallel is a parallelogram. Opposite sides are equal too, but it's not necessary to make that an explicit requirement, because if both pairs of opposite sides are parallel, then they also wind up being equal.
A parallelogram, a rhombus, a square and a rectangle
The practical answer is a parallelogram, which has two sets of parallel opposite sides and two sets of equal opposite angles. This includes rhombi, rectangles, and squares.A trapezoid (trapezium) has one set of parallel opposite sides that are not equal, but may have non-parallel opposite sides equal in length (isosceles trapezoid).
A trapezoid (UK trapezium) has D)one set of opposite sides parallel although they are of unequal length. An isosceles trapezoid has two sets of equal angles, at the ends of each of the parallel sides.
The opposite sides of a parallelogram are both parallel and equal.