increased Sphéno-crown
The increased sphéno-crown is a Polyèdre which belongs to the solid of Johnson ( J 87), it is obtained starting from a Sphéno-crown which one attached a square Pyramide ( J 1) on a square face. It is one of the elementary solids of Johnson who does not appear starting from handling in " to copy/coller" of solid of Plato of solid of Archimedes.
The 92 solid of Johnson were named and described by Norman Johnson in 1966.
External bonds
- MathWorld.wolfram.com - Johnson Solid
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