e Q of the two lines from the center of Y to X and Y to Z (as depicted in Figure 35.4) and returns the distance dxz. g is defined as follows 9(0) = V(dxy - dvz sin (0))2 + (dYz cos (0 2 So 1 ≤ dxz ≤ u. It is easy to see that g is monotone increasing and surjective, therefore there exists a function inverse C I