Answer:
r=4.51 ft
Step-by-step explanation:
Area of a circle is given by
[tex]A=\pi r^{2}[/tex] where A is area and r is the radius. Making r the subject of the above formula then
[tex]r=\sqrt {\frac {A}{\pi}}[/tex]
Substituting A with 64 then
[tex]r=\sqrt {\frac {64}{\pi}}\approx 4.51 ft[/tex]
