Bicone

This article is about the geometric shape and is not to be confused with Bicorne.

In geometry, a bicone or dicone (from Latin: bi-, and Greek: di-, both meaning "two") is the three-dimensional surface of revolution of a rhombus around one of its axes of symmetry. Equivalently, a bicone is the surface created by joining two congruent right circular cones at their bases. A bicone has circular symmetry and orthogonal bilateral symmetry.

Geometry

For a bicone with radius ${\displaystyle r}$ and half-height ${\displaystyle h}$, the volume is

${\displaystyle V={\frac {2}{3}}\pi r^{2}h}$

and the surface area is

${\displaystyle A=2\pi r\ell \,}$

where

${\displaystyle \ell ={\sqrt {r^{2}+h^{2}}}}$

is the slant height.

Regular right symmetric n-gonal bipyramids:

Bipyramid name	Digonal bipyramid	Triangular bipyramid	Square bipyramid	Pentagonal bipyramid	Hexagonal bipyramid	...	Apeirogonal bipyramid
Polyhedron image						...
Spherical tiling image						Plane tiling image
Face config.	V2.4.4	V3.4.4	V4.4.4	V5.4.4	V6.4.4	...	V∞.4.4
Coxeter diagram						...

See also

• Sphericon
• Biconical antenna