There is a pile of conical sand in the cement plant. The perimeter of the bottom is 62.8 meters and the height is 5 meters. Each cubic meter of sand weighs 1.5 tons. How many tons is the mass of this pile of sand?

62.8 △ 3.14 △ 2 = 10 (meters), 13 × 3.14 × 102 × 5 × 1.5, = 3.14 × 100 × 5 × 0.5, = 785 (tons); a: the weight of this pile of sand is 785 tons

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