Cross-sections of solids

Slicing through a 3D shape with a flat plane creates a 2D cross-section, like slicing a rectangular box straight across to reveal a rectangle, or at an angle to reveal a different shape. Going the other direction, rotating a 2D shape all the way around a line (an axis) sweeps out a 3D solid, like a rectangle rotated about one of its sides sweeping out a cylinder.

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