圆柱体?
底面C = 31.4m = 10 * 3.14 ,直径D大约为D = 10m
半径为r = 5m
那么表面积S = 底面积 × 2 + 侧面积 = 2 * pi * r * r + C * h = 2 * 3.14 * 5 * 5 + 31.4 * 8 = 408.2 m^2
体积 V = 底面积×高 = pi * r * r * h = 3.14 * 5 * 5 * 8 = 628 m^3
圆柱体?
底面C = 31.4m = 10 * 3.14 ,直径D大约为D = 10m
半径为r = 5m
那么表面积S = 底面积 × 2 + 侧面积 = 2 * pi * r * r + C * h = 2 * 3.14 * 5 * 5 + 31.4 * 8 = 408.2 m^2
体积 V = 底面积×高 = pi * r * r * h = 3.14 * 5 * 5 * 8 = 628 m^3