Two shafts A and B are made of the same material. The diameter of shaft B is thrice that of shaft A. What is the ratio of power which can be transmitted by A to power that can be transmitted by shaft B?
1
\(\frac{1}{{81}}\)
2
\(\frac{1}{3}\)
3
\(\frac{1}{9}\)
4
\(\frac{1}{27}\)