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Math Help - tetrahedron

  1. #1
    Senior Member pankaj's Avatar
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    tetrahedron

    Find radius of the incircle of a regular tetrahedron the length of each side being k units.
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  2. #2
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    earboth's Avatar
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    Quote Originally Posted by pankaj View Post
    Find radius of the incircle of a regular tetrahedron the length of each side being k units.
    I assume that you mean the insphere. If so have a look here:
    Tetrahedron - Wikipedia, the free encyclopedia

    If a is the length of one edge then the radius of the insphere is r = \dfrac a{\sqrt{24}}
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