Set of pyramidal right n-gonal frustums | |
---|---|
Faces | n isosceles trapezoids, 2 regular n-gons |
Edges | 3n |
Vertices | 2n |
Symmetry group | Cnv, [1,n], (*nn) |
Dual polyhedron | asymmetric bipyramid |
Properties | convex |
Net | |
Example: net of right trigonal frustum (n = 3) |
In geometry, a frustum (Latin for 'morsel');[a] (pl.: frusta or frustums) is the portion of a solid (normally a pyramid or a cone) that lies between two parallel planes cutting the solid. In the case of a pyramid, the base faces are polygonal and the side faces are trapezoidal. A right frustum is a right pyramid or a right cone truncated perpendicularly to its axis;[3] otherwise, it is an oblique frustum. In a truncated cone or truncated pyramid, the truncation plane is not necessarily parallel to the cone's base, as in a frustum. If all its edges are forced to become of the same length, then a frustum becomes a prism (possibly oblique or/and with irregular bases).
Cite error: There are <ref group=lower-alpha>
tags or {{efn}}
templates on this page, but the references will not show without a {{reflist|group=lower-alpha}}
template or {{notelist}}
template (see the help page).