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times both sides by 3- 70.65x3=211.95 and 1/3x3.14x2.5x3=7.85 then divide both sides by 3.14 211.95\3.14=67.5 and 7.85=2.5 then divide both sides by the height[2.5] 67.5\2.5=27 and 2.5\2.5=1

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