圆柱体底面半径： r = 12.56/3.14/2 = 2 (厘米)圆柱体底面积： m = 3.14 * (2^2) = 12.56 (平方厘米)未放入圆锥形时圆柱体中所占的体积： s = 12.56 * 5 = 62.8 (立方厘米)圆锥形体积 = m * 6 - s = 75.6 - 62.8 = 12.8 (立方厘米)
