( A = \pi r ^ { 2 } )
Cari nilai r (complex solution)
r=-\sqrt{\frac{A}{\pi }}
r=\sqrt{\frac{A}{\pi }}
Cari nilai A
A=\pi r^{2}
Cari nilai r
r=\sqrt{\frac{A}{\pi }}
r=-\sqrt{\frac{A}{\pi }}\text{, }A\geq 0
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