A rectangle (including squares). A quadrilateral has four sides. Think of the top and bottom of rectangles - they run parallel, as do the sides.
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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.
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.
A Trapezium is a quadrilateral with no parallel sides.
If it doesn't have parallel sides, it's just classified as a quadrilateral.
It is a trapezoid which has 1 pair of opposite parallel sides of different lengths