Answer:
The answer to your problem is:
The radius of circle F is 28.
Circle F and circle D are similar.
Explanation:
How to find the radius:
A = π ×

But the radius of a circle from diameter. If you can recall the diameter d, the radius is r = d / 2.
By looking at our facts we can actually see ( if we use the comparing method ) that the circles, F & D are very much similar.
Thus the answer to your problem is:
The radius of circle F is 28.
Circle F and circle D are similar.