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How do I decide if a point is within the triangle

  1. Feb 5, 2007 #1
    Hi all:
    Give three point P1, P2, P3 in R^3. How do I decide if a point P is inside of the triangle P1P2P3 please?
  2. jcsd
  3. Feb 5, 2007 #2


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    P1, P2, and P3, provided that they aren't colinear, determine a plane. So the first condition is that P lies in that plane. Then it becomes a problem in R^2.
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