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Two piles of rice

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Now a pile of rice is against a wall, it has a base perimeter of 60 feet and a height of 12 feet. What is the volume? Another pile lies in an inner corner, it has a base perimeter of 30 feet and a height of 12 feet. What is its volume? Still another pile lies on an outer corner, its perimeter is 90 feet and height 12 feet. What is its volume?

Cheng Dawei, China, 1592

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