If only one set of opposite sides is parallel, it is a trapezoid (UK trapezium).
If both pairs of opposite sides are parallel, it is a parallelogram. A parallelogram may be a rectangle, square, rhomboid, or rhombus.
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A Rectangle
A parallelogram. Opposite sides are parallel and congruent.parallelogram is a quadrilateral with two sets of parallel sides. The opposite sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are congruent. The three-dimensional counterpart of a parallelogram is a parallelepiped.Parallelogram - A quadrilateral whose opposite sides are parallel
Parallelogramwhat quadrillateral has parallel sides that are the same length; no right anglesA quadrilateral whose opposite sides are parallel is a rectangle.* * * * *A rectangle is a special case. The more general answer is a parallelogram.It's a Parallelogram
A square
A four sided figure with parallel sides is a parallelogram. A rhombus is a special type of a parallelogram with all sides equal. A rectangle is a special form of a parallelogram with all angles equal at 90°. A square is a special form of a rectangle with all sides equal.