A parallelogram.
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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.
Trapezoid.
a parallelogram
No, you need both pairs of opposite sides to be congruent (i.e. the same size) to be a parallelogram.
If both pairs of opposite angles of a quadrilateral are congruent, then it is a parallelogram.