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Math Help - Surface angle

  1. #1
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    Surface angle

    I need to find out two agles with from 3D triangle which I have the co-ordinates for. I need to find out which direction the triangle is sloping (in degrees) and what ang it is sloping at.
    I would put an image in to help describe but I dont know how to.

    Any ideas?
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  2. #2
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    The vector cross product does what you're looking for. When a and b are vectors describing the triangle, a \times b is a vector that is perpendicular (orthogonal) to the plane of the triangle, so it tells you the direction and angle of that plane.
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  3. #3
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    Thanks, thats just what i was looking for.
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