| 41. | Note the duality between the cube and the octahedron, and between the dodecahedron and the icosahedron.
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| 42. | The icosahedron is unique among the Platonic solids in possessing a dihedral angle not less than 120?
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| 43. | These all have icosahedral symmetry and may be obtained as stellations of the dodecahedron and the icosahedron.
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| 44. | The lattice has two basic structure units the B 12 icosahedron and the B 6 octahedron.
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| 45. | This polyhedron is the seventeenth stellation of the icosahedron, and given as Wenninger model index 42.
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| 46. | A truncation operation, repeatedly applied to the great icosahedron, produces a sequence of uniform polyhedra.
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| 47. | It has a related alternation honeycomb, represented by ?!, having icosahedron and tetrahedron cells.
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| 48. | The icosahedral shape is derived from the structure of an icosahedron which has 20 equilateral triangular faces.
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| 49. | The right one looks like it might be a subdivision surface generated by an actual truncated icosahedron.
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| 50. | A regular icosahedron is the optimum way of forming a closed shell from identical sub-units.
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