Datrys ar gyfer A, r, a, b (complex solution)
r=\sqrt{b}\text{, }A=\pi b\text{, }a=b\text{, }b\in \mathrm{C}
r=-\sqrt{b}\text{, }A=\pi b\text{, }a=b\text{, }b\in \mathrm{C}
Datrys ar gyfer A, r, a, b
r=-\sqrt{b}\text{, }A=\pi b\text{, }a=b\text{, }b\geq 0
r=\sqrt{b}\text{, }A=\pi b\text{, }a=b\text{, }b\geq 0
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