Formula for area of circle is defined:
[tex] a = \pi{r}^{2} [/tex]
Now just solve for radius.
[tex] {r}^{2} = \frac{a}{\pi} \implies \: r = \sqrt{ \frac{a}{\pi} } [/tex]
Now you insert the data.
[tex]r = \sqrt{ \frac{50.24}{3.14} } = \boxed{4 inches}[/tex]
Hope this helps!
