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There are several cases: any 3 dimensional or more object. Since a polygon is defined as being confined to a single plane, any shape that violates the plane is not a polygon but may still have parallel bases.
For cases in only 2 dimensions: Any object that has curves in addition to the parallel bases. A polygon's definition includes only straight sides.
Finally, unclosed shapes can have 2 parallel bases with out being polygons even if in a single plane and made up of only straight line sides. A polygon must be closed.
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Do The bases of a cylinder must be polygons?
A cylinder has circular parallel bases
What is a 3 dimensional figure with 2 congruent parellel bases that are polygons?
If, by parellel you mean parallel, the answer is a prism.
What is a 3 dimensional figure with 2 congruent parallel bases that are polygons?
I have no f*cking idea and i am a f*cking 7th grader.
What is a solid with two parallel bases that are congruent polygons and the lateral faces are parallelograms?
A prism.
What solid with two parallel bases that are congruent triangles has later faces that are parallelograms?
It is a prism. More specifically, "A solid figure that has two bases that are parallel, congruent polygons and with all other faces that are parallelograms." This describes the general prism. Replace "polygons" with "triangles" and you have specified a triangular prism.
