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\frac{20\pi }{6}\times 25=x
Whakareatia te 2 ki te 10, ka 20.
\frac{10}{3}\pi \times 25=x
Whakawehea te 20\pi ki te 6, kia riro ko \frac{10}{3}\pi .
\frac{10\times 25}{3}\pi =x
Tuhia te \frac{10}{3}\times 25 hei hautanga kotahi.
\frac{250}{3}\pi =x
Whakareatia te 10 ki te 25, ka 250.
x=\frac{250}{3}\pi
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.