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  1. 05-11-2013 #6
    EddyCurrent's Avatar
    Lives in West Cumbria, United Kingdom.
    EddyCurrent
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    With Excel you have to remember that the TAN() function uses Radians for the angle so the PI()/180 is to change the angle into radians.
    So if you use just a calculator it would be (requiredDiameter/2) X tan(angle in degrees)

    These are the angles reffered to.

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