Sheet for construction of regular polyhedron - has central fold line between pairs of diverging end fold lines

摘要

A regular polyhedron having twenty faces of regular hexagons and twelve faces of regular pentagons can be built from a number of identical units made from folded sheet. The building unit has two faces (31) which form parts of regular hexagons and two end faces which form parts of regular pentagons. The length of the side of the hexagon is equal to the length of side of the pentagon. The end edges (6) are shaped to fit one into another so that the whole assembly clips together to provide a stable structure and so obviates the need for any special form of supporting framework.