Answer: 5.7 (rounded)
Step-by-step explanation: The formula to find the diagonal of a square is
* a, where a is a side length on the square. Since we are solving for half of a diagonal, we use this formula and divide our result by two. We start by multiplying root 2 by 8 and we get 11.31371, next we divide by two and we get 5.656855 which is 5.7 when rounded.