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The measure of separation between two entities or locations that may or may not be connected, such as two points.
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Trilateration using known points, but relative distances
Since, two circles intersect if and only the distance between their centers is at most the sum of their radii, we must have at least one of the following inequalities:
(h1-h2)^2+(k1-k2)^2 <= 4d+2d = 6d …