| 21. | The twinned icosahedron is shown in figure 18a.
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| 22. | The vertices of a regular icosahedron are those of three mutually orthogonal golden rectangles.
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| 23. | The convex hull of two opposite edges of a regular icosahedron forms a golden rectangle.
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| 24. | An analogous modification to an octahedron produces an icosahedron, or " snub octahedron ."
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| 25. | Another common assembly is a truncated icosahedron.
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| 26. | The CeO 12 core defines an icosahedron.
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| 27. | The crest's form was inspired by the truncated icosahedron pattern of a football.
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| 28. | For example, the tridiminished icosahedron starts with a regular icosahedron with 3 vertices removed.
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| 29. | For example, the tridiminished icosahedron starts with a regular icosahedron with 3 vertices removed.
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| 30. | 1 ) Icosahedral-An icosahedron is a polygon with 12 vertices and 20 faces.
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