noun (plural frusta /-tə/ or frustums)Geometry
The portion of a cone or pyramid that remains after its upper part has been cut off by a plane parallel to its base, or that is intercepted between two such planes.
- An assessment task may ask students to devise a plan for determining the volume of the frustum of a pyramid (a task not previously considered in class).
- They only appear as frustums because they are being viewed at from an angle.
- Depending mainly on the thicknesses of the members, the midplane splits one of the two members into two frusta, thus making a total of three frusta to analyse.
Mid 17th century: from Latin, 'piece cut off'.
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