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Math Help - Non-Euclidian Geometry and Cross Ratios

  1. #1
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    Non-Euclidian Geometry and Cross Ratios

    I am taking a non-euclidian geometry class and it is killing me. I am trying to understand this stuff but it has been many years since I sat in a calculus or geometry class.

    Here are my problems:

    1. If (A,B;C,D) = r, show that (D,C;A,B) = 1/r
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  2. #2
    Site Founder Math Help's Avatar
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    Check out this site

    I am not familiar with cross ratios butcheck out wolfram's site on Cross Ratios

    Please post if you get any further along.
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