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Math Help - Tetrahedrom

  1. #1
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    Tetrahedrom

    ABCD is a regular tetrahedron , its sides are of equal length . E and F are the midpoints of AB and CD respectively .

    I am not sure what a tetrahedron is . Can someone show me the sketch ? Thanks !!
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  2. #2
    Moo
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    Hello,

    type tetrahedron in google, or google image

    And you'll get this, for example :

    http://www.math.wichita.edu/history/...trahedron2.gif

    (it's a 3-dimension structure)
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  3. #3
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    Quote Originally Posted by thereddevils View Post
    ABCD is a regular tetrahedron , its sides are of equal length . E and F are the midpoints of AB and CD respectively .

    I am not sure what a tetrahedron is . Can someone show me the sketch ? Thanks !!
    This is the continuation of the question .

    Find the angle between

    (a) the plane ABEF and the plane CDEF .

    how can it be ABEF ?? Since E is the midpoint and AB ? I am confused .
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  4. #4
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    Yeah, that's weird... defining the plane ABF would have been enough

    Same for CDEF -> CDF...
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