Architecture
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Radius of circumsphere of regular tetrahedron

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In geometry, a tetrahedron is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners.

R = (6^(1/2)/4)*a =(3/8)^(1/2) * a  
a : Edge length of regular tetrahedron  


*** Âü°í¹®Çå[References] ***

https://en.wikipedia.org/wiki/Tetrahedron
R = (3/8)^(1/2) * a
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