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Tohaina

\pi \times 25+\pi \times 5\times 13
Tātaihia te 5 mā te pū o 2, kia riro ko 25.
\pi \times 25+\pi \times 65
Whakareatia te 5 ki te 13, ka 65.
90\pi
Pahekotia te \pi \times 25 me \pi \times 65, ka 90\pi .