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通过在 [0, h] 上旋转 y = (R/h)x 证明半径为 R 、高为 h 的圆锥的体积是 pi R^2 h/3 。
通过在 [0, h] 上旋转 y = (R/h)x 证明半径为 R 、高为 h 的圆锥的体积是 pi R^2 h/3 。
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