If 33 = 5.745 , then which of the following values is approximately 311 ?

Answer: Option C

$$\begin{array}{rl}& =\sqrt{\frac{3}{11}}\\ & =\sqrt{\frac{3\times 11}{11\times 11}}\\ & =\frac{\sqrt{33}}{11}\\ & =\frac{5.745}{11}\\ & =0.5223\end{array}$$