6. The area of square inside circle

$$\begin{array}{lcl} What\;is\;the\;ratio\;between\;the\;area\;of\\ the\;square\;and\;the\;area\;of\;the\;circle?\\ \\ (F)\; \frac{3}{\pi}\\ \\ (G)\; \frac{\pi}{4}\\ \\ (H)\; \frac{5}{2\pi}\\ \\ (J)\; \frac{\pi}{5}\\ \\ (K)\; \frac{2}{\pi}\\ \end{array}$$