So work the problem backward.
Normal way to solve problem
x^2 x 3.14 = area
Backward
324 / 3.14 = 103.184
[tex] \sqrt{103.184} [/tex] = 10.157
The answer is 10.157
But let's plug in the numbers to make sure
10.157^2 x 3.14 = 323.9.. or the rounded answer
(If you want an exact answer you have to throw it through a calculator)
