Answer:
Step-by-step explanation:
Our problem reduces to the following. Given D = 65 miles, what is the length of the missing side? Let us call the missing side x
To find out the length of the missing side, we use pythogoras' theorem.

Since we know that D = 65, the above becomes

taking the square root of both sides gives

which we evaluate to get: upon using a calculator.

rounding to the nearest mile gives

which is our answer!