I assume you mean "Pi" the mathematical term. Since pi is irrational, one-fourth pi is simply \(pi \over 4\).
Pi is 3.1415926535...so on and so forth never repeating so you cannot divide by four and get a simple answer.
Hope this helps!
You can actually get a close estimate on 1/4 of pi.
Assuming we use 3.14 as pi, and 1/4 of pi means 1/4 * 3.14:
1/4 * 3.14 = 0.785.
So a simple answer is 0.785...
(it goes longer, but thats a simple answer.)