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Math Help - Euclidean Geometry Question

  1. #1
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    Euclidean Geometry Question

    Hi!

    I attach a file here with a question and suggested solution. All is fine, except I would like to know how there is a sign change on |BE|^2 from the first line to the second line.

    Thanks in advance for your help.

    Josh
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  2. #2
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    Re: Euclidean Geometry Question

    Quote Originally Posted by redskies View Post
    Hi!

    I attach a file here with a question and suggested solution. All is fine, except I would like to know how there is a sign change on |BE|^2 from the first line to the second line.
    How? By a mistake in the suggested solution.
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  3. #3
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    Re: Euclidean Geometry Question

    Is it really a mistake??.....The creator of the solution is generally not a mistake-maker.Thanks ChessTal for the reply....Is there any way that the sign could be changed for some reason we are missing?
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  4. #4
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    Re: Euclidean Geometry Question

    Quote Originally Posted by redskies View Post
    Is it really a mistake??.....The creator of the solution is generally not a mistake-maker.
    Yes but he is a human. :-)

    Thanks ChessTal for the reply....Is there any way that the sign could be changed for some reason we are missing?
    Only if B and E where identical. But |BE| is not zero so they are not identical. Therefore....
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  5. #5
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    Re: Euclidean Geometry Question

    It's just a slip of the pen, the sign should be negative.
    However, it would seem that you have not even noticed the main mistake, (which happens on the fourth line).
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