The Compendium Geometry is an eBook providing facts, formulas and explanations about geometry. 
Home Analytic Geometry 3D Solids Platonic Solids Icosahedron  
See also: Platonic Solids  Regular Polyhedra  
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IcosahedronA regular icosahedron is one of the Platonic solids having 20 equilateral triangular faces. The volume V of the icosahedron is given by its surface S is defined by The radii of the circumscribed (r_{c}) and inscribed (r_{i}) spheres are = a0.951056516295153572116439...,


Home Analytic Geometry 3D Solids Platonic Solids Icosahedron 