Answer:
r = (11√π)/π
Step-by-step explanation:
V = πr²h
We are given V = 1089, and h = 9. Plug them into the formula and simplify
1089 = πr²(9)
121 = πr² (divide by 9 on both sides)
121/π = r² (divide by π on both sides)
√(121/π) = r (take the square root of both sides)
Now simplify √(121/π)
(√121)/(√π)
11/√π
[11(√π)]/[(√π)(√π)]
(11√π)/π
so r = (11√π)/π
