Do you have a problem you need help one or just the steps in general
Area of a circle formula:
![A = \pi r^{2}](https://tex.z-dn.net/?f=A%20%3D%20%5Cpi%20r%5E%7B2%7D%20)
You're given that A = 615.75, so:
![615.75 = \pi r^{2}](https://tex.z-dn.net/?f=615.75%20%3D%20%5Cpi%20r%5E%7B2%7D%20)
Solve for r:
![r = \sqrt{(615.75/ \pi )} r = 14 cm](https://tex.z-dn.net/?f=r%20%3D%20%20%5Csqrt%7B%28615.75%2F%20%5Cpi%20%29%7D%0A%0Ar%20%3D%2014%20cm)
Diameter is equal to twice the radius, so doubling 14 gives you
I will do the best i can every day, and i will be positive, and i wont blame myself for anything that is out of my hands.