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A shape must have 4 sides in order to be a parallelogram (minus other defining characteristics a shape must have to be a parallelogram).
In order to answer that question i must know the size of this said shape.
A pair of scissors.
2. One at the top and one at the bottom. The face that is cylindrical cannot be counted as a base because it is curved - in 3D shapes the base must be flat.
Any polygon must have at least three sides. So a shape with only one pair of adjacent sides must be lenticular (shaped like a lens) else it is some very odd shape.