Solve for A, r, a, b, c
r=-\sqrt{c}\text{, }A=\pi c\text{, }a=c\text{, }b=c\text{, }c\geq 0
r=\sqrt{c}\text{, }A=\pi c\text{, }a=c\text{, }b=c\text{, }c\geq 0
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