From the formula:
Distance = Sq Root [(X2 -X1)^2 + (Y2 -Y1)^2]
Distance = Sq Root [(1 -4)^2 + (12 -8)^2
Distance = Sq Root [-3^2 + 4^2]
Distance = Sq Root [9 + 16]
Distance = 5
Source 1728.com/distance.htm
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