单词	frustum
释义	frustum /ˈfrʌstəm / noun (plural frusta /ˈfrʌstə/ or frustums) Geometry The portion of a cone or pyramid which remains after its upper part has been cut off by a plane parallel to its base, or which 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. Origin Mid 17th century: from Latin, 'piece cut off'.
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