Aperson drives north 6 blocks, then drives west 6 blocks. the displacement is a straight line from the starting point to the finish in a direction

For the answer to the question above, A person drives north 6 blocks, then drives west 6 blocks. the displacement is a straight line from the starting point to the finish in 8.49 blocks in a Northwest direction.
The Solution:
A^2+B^2=C^2

6*6+6*6 = sqrt(72)

If you divide 0.1 and 0.6 you wii get 0.166666 which rounds to .167 which is answer b