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In geometry, a frustum[1] is the portion of a solid that lies between one or two parallel planes cutting it. A right frustum is a parallel truncation of a right pyramid.

Set of pyramidal frustums
Pentagonal frustum.svgUsech kvadrat piramid.png
Examples: Pentagonal and square frustum
Faces n trapezoids, 2 n-gons
Edges 3n
Vertices 2n
Symmetry group Cnv, [1,n], (*nn)
Properties convex

In geometry, a frustum (plural: frusta or frustums) is the portion of a solid (normally a cone or pyramid) that lies between one or two parallel planes cutting it. A right frustum is a parallel truncation of a right pyramid.

The term is commonly used in computer graphics to describe the viewing frustum, the three-dimensional region which is visible on the screen. It is formed by a clipped pyramid; in particular, frustum culling is a method of hidden surface determination.

In the aerospace industry, frustum is the common term for the fairing between two stages of a multistage rocket (such as the Saturn V), which is shaped like a truncated cone.