Before the honeycomb conjecture, these shapes were the subject of Thomas Hales' proof of the Kepler 
Before the honeycomb conjecture, these shapes were the subject of Thomas Hales' proof of the Kepler   conjecture, which gives the most efficient way to pack these shapes into a space. A set consisting  of the complex numbers and a point at infinity is called the Riemann type of this shape. It can   be generated in cylindrical coordinates by setting 𝑟 2 + 𝑧 2 ["𝑟  squared plus 𝑧  squared"] equal to a constant, and this shape can be generated in a coordinate system named for it by setting rho equal  to a constant. Geodesics on this shape are called great circles, and the formula for its volume is  four-thirds pi times radius cubed. Name this three-dimensional figure.
Before the honeycomb conjecture, these shapes were the subject of Thomas Hales' proof of the Kepler   conjecture, which gives the most efficient way to pack these shapes into a space.