Respuesta :

a=pi*r^2
220=pi*r^2
r=8.36828 
or
r = 2 sqrt(55/pi)

Use algebra.com. It is a good website.
imaihcaiosh

Answer: If the options are the square root of 70 and square root of 30 sum i forgot what it was it would be square root of 70

Step-by-step explanation: i got it right