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Á¤À̽ʸéü(Regular icosahedron)¿¡ ³»Á¢(inscribe)ÇÏ´Â ±¸ÀÇ ¹ÝÁö¸§

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If the edge length of a regular icosahedron is a, the radius of a inscribed sphere (tangent to each of the icosahedron¡Çs faces) is

ri = (3)^(1/2) / 12 * (3+5^(1/2))*a ¡Ö 0.7557613141*a

*** Âü°í¹®Çå[References] ***

https://en.wikipedia.org/wiki/Regular_icosahedron
ri = (3)^(1/2) / 12 * (3+5^(1/2))*a
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