Question

there is a pool of radius x and there is a path way around the pool with a width of 4 feet. find the radius of the pool if the path area / pool area = 11/25. a) 12 b) 5 c) 25 d) 29

Answer 1

(PI.(X+4)^2-PI.X^2)/PI.X^2=11/25
(X+4)^2/X^2-1=11/25
(X+4)^2/X^2=36/25
(X+4)/X=6/5
X=20 feet