To find the radius of a circle given its area, you can use the formula for the area of a circle:
\[ A = \pi r^2 \]
where \(A\) is the area and \(r\) is the radius.
Given that the area \(A = 28.26 , \text{cm}^2\), we can solve for the radius \(r\):
\[ 28.26 = \pi r^2 \]
Now, divide both sides by \(\pi\):
\[ r^2 = \frac{28.26}{\pi} \]
Using \(\pi \approx 3.14\):
\[ r^2 = \frac{28.26}{3.14} \approx 9 \]
Now take the square root of both sides:
\[ r = \sqrt{9} = 3 \]
Therefore, the radius of the circle is:
\[ \boxed{3 , \text{cm}} \]