Three-dimensional figure bounded by a closed surface whose volume can be measured and whose points all have unchanging distances, which allows the figure’s shape and volume to be determined.

There are various classes of solids, such as:

Solids can be solid or hollow.

Polyhedra, cones and cylinders have nets. However, a sphere does not have a net.

Euler’s formula can only be applied to convex polyhedra.

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