Solve for D (complex solution)
D=-\sqrt{d^{2}+\frac{4A}{\pi }}
D=\sqrt{d^{2}+\frac{4A}{\pi }}
Solve for A
A=\frac{\pi \left(D^{2}-d^{2}\right)}{4}
Solve for D
D=\sqrt{d^{2}+\frac{4A}{\pi }}
D=-\sqrt{d^{2}+\frac{4A}{\pi }}\text{, }A\geq -\frac{\pi d^{2}}{4}
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