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Math Help - How in earth they find this angle??!

  1. #1
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    How in earth they find this angle??!

    Just one question
    How did he find this angle?
    Need explain
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  2. #2
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    Dear TWiX,

    The area bounded by F_{1} , F_{2} and the two dotted lines must be a parallogram.

    Then, F_{1}\hat{O}F_{2}=60^{o}+45^{o}=105^{o}

    Therefore, \psi=180^{o}-105^{o}=75^{0}

    Hope this helps.
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