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Hi, Suppose I have three 2D points A, B, C. And two points, namely A and B form a line. How can I determine in mathematica on which side, (so which half-plane formed by) of the line, point C is. So when I input three points I want to know if the third point is on the left or right side of the half plane formed by the line (ray) A,B. Appreciate any help.