Solve for d
d=\frac{11088}{\pi r^{2}}
r\neq 0
Solve for r
r=12\sqrt{\frac{77}{\pi d}}
r=-12\sqrt{\frac{77}{\pi d}}\text{, }d>0
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d\pi r^{2}=11088
Multiply both sides of the equation by 360.
\pi r^{2}d=11088
The equation is in standard form.
\frac{\pi r^{2}d}{\pi r^{2}}=\frac{11088}{\pi r^{2}}
Divide both sides by \pi r^{2}.
d=\frac{11088}{\pi r^{2}}
Dividing by \pi r^{2} undoes the multiplication by \pi r^{2}.
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