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.
Given that the area \( A \) is 28.26 cm², you can rearrange the formula to find the radius:
\[ r^2 = \frac{A}{\pi} \]
Now, substituting the given area:
\[ r^2 = \frac{28.26}{\pi} \]
Using \( \pi \approx 3.14 \):
\[ r^2 = \frac{28.26}{3.14} \approx 9 \]
Taking the square root of both sides to find \( r \):
\[ r = \sqrt{9} = 3 , \text{cm} \]
So, the radius of the circle is \( \mathbf{3 , cm} \).