A dipyramid having a hexagonal base. The volume of a hexagonal pyramid having a regular hexagon with side length  as a base and of half-height 
 is therefore
The volume common to the two cubes in a cube 2-compound is a hexagonal pyramid.
 
	    
	
    
A dipyramid having a hexagonal base. The volume of a hexagonal pyramid having a regular hexagon with side length  as a base and of half-height 
 is therefore
The volume common to the two cubes in a cube 2-compound is a hexagonal pyramid.
Weisstein, Eric W. "Hexagonal Dipyramid." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/HexagonalDipyramid.html