Whakaoti i te A/pi=pir^2/pi

$$\frac { A } { \pi } = \frac { \pi r ^ { 2 } } { \pi }$$

Whakaoti mō A

$$A=\pi r^{2}$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Me whakakore te \pi me te \pi .

$$\frac{A}{\pi }=r^{2}$$

He hanga arowhānui tō te whārite.

$$\frac{1}{\pi }A=r^{2}$$

Whakawehea ngā taha e rua ki te \pi ^{-1}.

$$\frac{\frac{1}{\pi }A\pi }{1}=\frac{r^{2}\pi }{1}$$

Mā te whakawehe ki te \pi ^{-1} ka wetekia te whakareanga ki te \pi ^{-1}.

$$A=\frac{r^{2}\pi }{1}$$

Whakawehe r^{2} ki te \pi ^{-1}.

$$A=\pi r^{2}$$

Whakaoti mō r (complex solution)

$$r=-\sqrt{\frac{A}{\pi }}$$

$$r=\sqrt{\frac{A}{\pi }}$$

Whakaoti mō r

$$r=\sqrt{\frac{A}{\pi }}$$

$$r=-\sqrt{\frac{A}{\pi }}\text{, }A\geq 0$$