The area of a circle can be written as $$Area=\pi\frac{D^2}{4}$$ where D is the diameter.
$$$528=\pi\frac{D^2}{4}$\\
Multiply both sides by $\frac{4}{\pi}$\\
$$D^2=\frac{4*528}{\pi}$$\\
take the square root of both sides\\
$$ D=\sqrt{\frac{4*528}{\pi}}$$$$
$${\mathtt{D}} = {\sqrt{{\frac{{\mathtt{4}}{\mathtt{\,\times\,}}{\mathtt{528}}}{{\mathtt{\pi}}}}}} \Rightarrow {\mathtt{D}} = {\mathtt{25.928\: \!179\: \!257\: \!714\: \!298}}$$ feet
or D ≈ 25.93feet
Incidentally, the area would be in square feet, not just feet!
The area of a circle can be written as $$Area=\pi\frac{D^2}{4}$$ where D is the diameter.
$$$528=\pi\frac{D^2}{4}$\\
Multiply both sides by $\frac{4}{\pi}$\\
$$D^2=\frac{4*528}{\pi}$$\\
take the square root of both sides\\
$$ D=\sqrt{\frac{4*528}{\pi}}$$$$
$${\mathtt{D}} = {\sqrt{{\frac{{\mathtt{4}}{\mathtt{\,\times\,}}{\mathtt{528}}}{{\mathtt{\pi}}}}}} \Rightarrow {\mathtt{D}} = {\mathtt{25.928\: \!179\: \!257\: \!714\: \!298}}$$ feet
or D ≈ 25.93feet
Incidentally, the area would be in square feet, not just feet!