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Tohaina

20\pi \times \frac{1}{2}
Whakahekea te hautanga \frac{180}{360} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 180.
\frac{20}{2}\pi
Whakareatia te 20 ki te \frac{1}{2}, ka \frac{20}{2}.
10\pi
Whakawehea te 20 ki te 2, kia riro ko 10.