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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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