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Polyhedron geometry. These 2D surfaces of regular polygons are known as the net of the polyhedron (or polyhedral nets). At upper left is a regular tetrahedron, formed from a net of four triangles. Next to this is a cube, formed from a net of six squares. The octahedron next to the cube is a net of eight triangles. At top right is a dodecahedron, with its net of twelve pentagons at lower centre. At lower left is an icosahedron, with its net of twenty triangles at lower right. Artwork from 'Encyclopaedia Metropolitana' (1845).
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