To clarify the computational procedure, a numerical example for to the right is presented. Suppose that the observed distances lAU, lBU, and lCU are 6049.00, 4736.83, and 5446.49 ft, respectively, and the control stations have coordinates in units of feet of
xa = 865.40 ya = 4527.15
xb = 2432.55 yb = 2047.25
xc = 2865.22 yc = 27.15