The circumference would be:
\(C=2*\pi*r\)
\(C=2*3.14*4\)
\(C=3.14*8\)
\(C=25.12\space ft\)
Since you want to find the equal distance from each other, divide the answer by 5.
\(\frac{25.12}{5}=5.024\)
So, your answer is that the equal distance that everyone is far from each other is 5.024
hope that helps