Not true. They have only one base and several (3 or more) lateral triangular faces.
A pyramid has a single vertex over a base - there are no parallel faces in any pyramid.
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A prism
Prisms.
At least (and at most).
No. A quadrilateral is trapezoid if it has at least one pair of parallel sides.
Any shape with at least two straight sides can have opposite parallel and congruent sides. For example, a running track.