Answer:
r = 15 in
Step-by-step explanation:
The formula of a volume of a cylinder:
[tex]V=\pi r^2H[/tex]
r - radius
H - height
We have
[tex]V=225\pi in^3\\\\H=1\ in[/tex]
Substitute:
[tex]225\pi=\pi r^2(1)[/tex] divide both sides by π
[tex]225=r^2\to r=\sqrt{225}\\\\r=15\ in[/tex]
