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PD = pseudo distance

Graphically,
Image Removed Image Added
 
 H: host
L1: Landmark 1
L2: landmark 2
L3: landmark 3
 
Using distance farmula:
D1= ?(XL1- Xh)^2 + (YL1 - YH)^2    ............................................. (2)
FROM (1) & (2)

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