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20\sqrt{2}
Tauwehea te 800=20^{2}\times 2. Tuhia anō te pūtake rua o te hua \sqrt{20^{2}\times 2} hei hua o ngā pūtake rua \sqrt{20^{2}}\sqrt{2}. Tuhia te pūtakerua o te 20^{2}.