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Math Help - Normal vector

  1. #1
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    Normal vector

    I took 2 plots.
    Can someone explain to me why the first one comes out positive and second negative?
    Attached Thumbnails Attached Thumbnails Normal vector-scan0007.jpg  
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  2. #2
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    Quote Originally Posted by asi123 View Post
    I took 2 plots.
    Can someone explain to me why the first one comes out positive and second negative?
    The formula gives an inward or an outward normal. There's no way of knowing which until you check.
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