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p to this edge.
point.
(x,y).
 dx1*dy2 + dx2*dy1
 
 Dot product is zero if the vectors defined by the 2 vectors are
 orthogonal.
p.
 x1*x2 + y1*y2 + z1*z2
 
 Dot product is zero if the vectors defined by the 2 vectors are
 orthogonal.
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