Question

一个圆锥形石堆,底面半径是2米,高1.5米.每立方米碎石约重1.8吨

Answer 1

v= 1/3πr^2 h = 1/3 π x4 x 1.5 = 2π立方米

2π x 1.8 = 3.6π ≈ 3.6 x3.14 ≈11.304吨