błagam dla najszybszego daje naj (r-2)^2 +3^2=r^2
(r-2)^2 +3^2=r^2
r^2 - 4r + 4 + 9 = r^2
-4r + 13 = 0
-4r = -13
r = 13/4
r = 3 i 1/4
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(r-2)^2 +3^2=r^2
r^2 - 4r + 4 + 9 = r^2
-4r + 13 = 0
-4r = -13
r = 13/4
r = 3 i 1/4