The area of a circle is 36cm^2 how do I find the radius?

The area of a circle is 36cm^2 how do I find the radius ?

$$\small{\text{The area of a circle is }} A = \pi r^2 \\ A = 36\ cm^2, \\ \small{\text{ then the radius } r = \sqrt{ \frac{A }{\pi} } = \sqrt{ \frac{36\ cm^2 }{\pi} } =\frac{ 6 } {\sqrt{\pi} }\ cm = 3.38513750129 \ cm \approx 3.385\ cm }$$