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Math Help - Tetrahedron

  1. #1
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    Tetrahedron

    We've got a tetrahedron ABCD, in which the BCA = BAD,
    a sphere with center S appended to this tetrahedron is tangent to the wall
    ABC in the middle of the circle described on this wall. To prove that a straight lines
    AD and AS are perpendicular.
    (Note: The sphere appended to the tetrahedron is the sphere tangent to exactly
    one wall and the other three planes containing the wall.)
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  2. #2
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    Re: Tetrahedron

    Google Tetrahedron Wiki and then edit your post
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  3. #3
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    Re: Tetrahedron

    Sorry for any mistakes but I translated it from my mother language and my english is not perfect
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