An icosahedron is a polyhedron with twenty faces, its name drawn from the Ancient Greek words for twenty and seat. There are infinitely many non-similar shapes of icosahedra, some more symmetrical than others; the best known is the regular icosahedron, a convex, non-stellated solid and one of the five Platonic solids, whose twenty faces are all equilateral triangles.
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Source Wikipedia: Icosahedron
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1. Wikipedia: Icosahedron
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In geometry, an icosahedron ( or ) is a polyhedron with 20 faces.
In Branch: Geometry, Lead sentence
In geometry, an icosahedron ( or ) is a polyhedron with 20 faces.
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