To find the radius of a circle when you know the 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. You have the area \( A = 28.26 \) cm².
To find the radius, rearrange the formula to solve for \( r \):
\[ r = \sqrt{\frac{A}{\pi}} \]
Now substitute in the value for \( A \):
\[ r = \sqrt{\frac{28.26}{\pi}} \]
Using \( \pi \approx 3.14 \):
\[ r = \sqrt{\frac{28.26}{3.14}} \approx \sqrt{9} = 3 \]
So, the radius of the circle is approximately \( 3 \) cm.