Hi

(6,1) 

(2,-3)  m = 4/4 = 1   D = sqrt(32), D^2 = 32

(4,-5)  m = 2/-2 = -1  Lines perpendicular, right angle, d = sqrt(8), D^2 = 8

(6,1)  D = sqrt(36 + 4) = sqrt(40), D^2 = 40

   32 + 8 = 40

 

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