Spherical coordinates position vector

  1. can anyone help me with this question:
    A sphere of unit radius is centered at the origin. points U,V & W on the surface of the sphere have vectors u,v & w. find the position vector of points P&Q on a diameter perp to the plane containing points U,V & W?

    can anyone help
  2. jcsd
  3. Astronuc

    Staff: Mentor

    In Cartesian coordinates if the points U, V, W are coplanar, to which position vectors u, v, w point, respectively, what can one do to create two planar vectors? Hint. What is the formula for the vector pointing from U to V? Similarly for V to W or U to W.

    Now with two coplanar vectors, how does one find a vector perpendicular to those two?
  4. tripple scaler product?
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