Answer: 8 miles
Step-by-step explanation: If we drew out the problem we would get a right triangle where d is the hypotenuse and the 16 miles south and the 12 miles east would be the legs of such a triangle. Then using the Pythagorean theorem we get:
![d^2=16^2+12^2=400](https://img.qammunity.org/2020/formulas/mathematics/high-school/le9neoq59xnv3z5mdeejcjabirqwsyd6hw.png)
If we then take the square root of both sides we get:
![d=√(400) =20](https://img.qammunity.org/2020/formulas/mathematics/high-school/cjxkifq2fog2eeqyzbywz6vcnnu5qak7n7.png)
Then we realize that the pilot was forced to travel 8 extra miles because
![(16+12)-20=28-20=8](https://img.qammunity.org/2020/formulas/mathematics/high-school/qvwzp87gx6cpbjx0frmkw59g339zfg998y.png)