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    Ok, I have points U, V and W
    The line UV is perpendicular to a plane in which U lies.

    How does the fact that WV^2 = WU^2 + UV^2 tell me that W is in the plane ?

    Thanks
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    It means that UVW is a right-angled triangle (with the right-angle at U). This means that UW is perpendicular to UV, so it lies in the plane (since UV is the normal to the plane).
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    (Original post by nuodai)
    It means that UVW is a right-angled triangle (with the right-angle at U). This means that UW is perpendicular to UV, so it lies in the plane (since UV is the normal to the plane).
    Ahh, yes, ok.
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    If the equation is (WV)^2 = (WU)^2 + (UV)^2 then just think of it as pythagoras with (WV)^2 being the hypotenuse. I always find drawing a diagram for vectors can be useful, especially 'show that' style questions. Hope this helps

    Edit: Basically what nuodai said..I'm too slow!
 
 
 
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