65
Do you remember the Pyhagorean Theorem? The theorem states that the sides of a right triangle will relate to each other based on the formula a2 + b2 = c2. The easiest-to-calculate right triangle is the 3-4-5 triangle. 32 = 9, 42 = 16; 9+16 = 25 which is 52. To get the coordinates for this puzzle you need to calculate the hypotenuse of a right triangle with the first two given sides. So if you are given (3, 4), the answer is 5.
The final coordinates are North 38 A.B; West 96 C.D
A = (40, 42)
B = (340, 357)
C = (9, 12)
D = (498, 664)
You can check your answers for this puzzle on GeoChecker.com.