Whakaoti i te pi60^2*90/4

$$\pi 60 ^ { 2 } \cdot 90 / 4$$

Aromātai

$$81000\pi \approx 254469.004940773$$

Ngā Upane Otinga

Tātaihia te 60 mā te pū o 2, kia riro ko 3600.

$$\pi \times 3600\times \frac{90}{4}$$

Whakahekea te hautanga \frac{90}{4} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$\pi \times 3600\times \frac{45}{2}$$

Tuhia te 3600\times \frac{45}{2} hei hautanga kotahi.

$$\pi \times \frac{3600\times 45}{2}$$

Whakareatia te 3600 ki te 45, ka 162000.

$$\pi \times \frac{162000}{2}$$

Whakawehea te 162000 ki te 2, kia riro ko 81000.

$$\pi \times 81000$$