Because a quadrilateral is any four-sided shape, whereas a parallelogram must have opposite sides and equal angels. A trapezoid only has two sides and equal angles.
In other words, a parallelogram has 2 pairs of parallel sides but a trapezoid only has one pair (top and bottom).
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A kite or a trapezoid
No.
triangle
quadrilateral , trapezoid ,polygon ,not a parallelogram
No