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 r and half-height h, the volume is
V = \frac{2}{3} \pi r^2 h
and the surface area is
A =2\pi r \ell\,
where
\ell = \sqrt{r^2 + h^2}
is the slant height.