I am trying to get a formula to produce a distance in feet
Example:
A B C
X corrd y corrd
1 6806.9 1680.62
2 7243.67 1509.92 (Dist. Between a1 & a2)
3 6751.07 1319.53 (Dist. Between a2 & a3)

The numbers are X & Y Coordinates for devices in a CAD program.

I have a formula that I was trying: (ABS(A1-A2)+ABS(B3-B2))/12)
But the results dont match to the distance in the CAD drawing. Or, are my
math skills that bad???