Any 2 points you designate as 'A' and 'B' can represent those 2 points.
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it takes N-miles from point A to Point B and so on and so on
true the distance from point A to point B on a grid = vector
(B - A)2 - 81 or (B - A + 9)(B - A - 9) If the starting point, A, is taken as zero the the expression simplifies to (B + 9)(B - 9)
the density will be greater at point B because my mommy says
B(1,-5)