The solid obtained after a
cone or
pyramid has been cut by one or two planes parallel to its base.
Examples
- A truncated cone is called a frustum if the cone is cut by a plane that is parallel to the base.
The solid at the bottom is the frustum of the cone.
- A truncated pyramid is called a frustum if the pyramid is cut by a plane that is parallel to the base.
The solid at the bottom is the frustum of the pyramid.
Etymological Note
The term "frustum" is derived from the Latin word frustum meaning "piece" or "bit".
