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A cylinder is best described as congruent on parallel planes or discs.
The solid enclosed by this surface and by two planes perpendicular to the axis is also called a cylinder.
A cylinder
There are many possible answers: A cylinder A cone sliced by two planes perperndicular to its axis A toroid (doughnut) sliced by a plane vertical to its axis. A sphere sliced by two planes An ellipsoid sliced by two planes A paraboloid sliced by two planes etc.