Answer:
9.05 W
Explanation:
The given formula is [tex]r=\sqrt {\frac {P}{0.02\pi}}[/tex] where r is in centimeters and P is in Watts
Making Power, P the subject from the above formula
[tex]P=0.02\pi r^{2}[/tex]
Substituting r with 12 cm then
[tex]P=0.02\pi 12^{2}=
9.047786842 W\approx 9.05 W[/tex]
