Answer:
You should use a calculator. The square root of 75 is about 8.66. Each wall in your office space should be about 8.66 feet long.
Extra Credit: Now you that you know about square roots, what do you think a cube root is? I'll give you a hint: the cube root of 8 is 2. SO, your extra credit question for the day is, what is the cube root of 1,000?