I would be seriously concerned if a quadrilateral had more than two pairs of opposite sides parallel!
A quadrilateral with two pairs of opposite sides parallel is a parallelogram.
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Only if it is a trapezoid (US usage) with one set of parallel sides, or a parallelogram with both sets of opposite sides parallel. The term quadrilateral only means that the shape has 4 sides.
A trapezoid.
No. The only conditions to quality as a parallelogram is that it is a quadrilateral, and that opposite sides are parallel.
The trapezoid (UK trapezium) has only 1 pair of unequal parallel sides.
No, it doesn't have to be. A quadrilateral can definitely be a parallelogram only if: - Both pairs of opposite sides are parallel. - Both pairs of opposite sides are congruent. - One pair of opposite sides are both congruent and parallel. - Both pairs of opposite angles are congruent. - The diagonals bisect each other.