Elongated square cupola
In geometry, the elongated square cupola is one of the Johnson solids. As the name suggests, it can be constructed by elongating a square cupola by attaching an octagonal prism to its base. The solid can be seen as a rhombicuboctahedron with its "lid" removed.
Formulae
The following formulae for volume, surface area and circumradius can be used if all faces are regular, with edge length a:Dual polyhedron
The dual of the elongated square cupola has 20 faces: 8 isosceles triangles, 4 kites, 8 quadrilaterals.| Dual elongated square cupola | Net of dual |