Whakaoti mō A
A=\pi r^{2}
Whakaoti mō r
r=\sqrt{\frac{A}{\pi }}
r=-\sqrt{\frac{A}{\pi }}\text{, }A\geq 0
Tohaina
Kua tāruatia ki te papatopenga
\frac{A}{\pi }=r^{2}
Me whakakore te \pi me te \pi .
\frac{1}{\pi }A=r^{2}
He hanga arowhānui tō te whārite.
\frac{\frac{1}{\pi }A\pi }{1}=\frac{r^{2}\pi }{1}
Whakawehea ngā taha e rua ki te \pi ^{-1}.
A=\frac{r^{2}\pi }{1}
Mā te whakawehe ki te \pi ^{-1} ka wetekia te whakareanga ki te \pi ^{-1}.
A=\pi r^{2}
Whakawehe r^{2} ki te \pi ^{-1}.
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