Respuesta :

rarrininger
A=π r²
530.66 = 3.14  r²
530.66/3.14 = 3.14/3.14  (r²)
r² = 169
√r²=√169
r=13

Now that you have your radius you can figure out circumference.
Circumference = 2 π r
Circumference = 2 X 3.14 X 13
Circumference = 81.64 ft