The distance is

d = sqrt( [p - 2r]^2 + [q - 2r]^2 )

where

r = pq/t

and

t = p + q + sqrt( p^2 + q^2 )

For (p,q) = (15,8),

t = 40

r = 3

d ~= 9.22

Edited on October 10, 2012, 8:26 pm

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