a circular swimming pool is surrounded by a concrete wall 4 feet wide . if the area of the wall is 11 / 25 of the area of the pool , then the radius of the pool in feet is ?
import math
n0 = 4.0
n1 = 11.0
n2 = 25.0
t0 = n1 / n2
t1 = n0 * 2.0
t2 = n0**min(2.0, 5)
t3 = t0 * 4.0
t4 = t1**min(2.0, 5)
t5 = t3 * t2
t6 = t5 + t4
t7 = math.sqrt(max(0, t6))
t8 = t1 + t7
t9 = t8 / t0
answer = t9 / 2.0
print(answer)