求下列圆锥的体积底面半径是5厘米,高是12厘米; 底面周长是18.84厘米,高是8厘米.
求下列圆锥的体积底面半径是5厘米,高是12厘米;底面周长是18.84厘米,高是8厘米....
求下列圆锥的体积底面半径是5厘米,高是12厘米; 底面周长是18.84厘米,高是8厘米.
展开
(1)
×3.14×5
2×12,
=
×3.14×25×12,
=3.14×25×4,
=3.14×100,
=314(立方厘米).
答:这个圆锥的体积是314立方厘米.
(2)18.84÷(2×3.14),
=18.84÷6.28,
=3(厘米),
×3.14×3
2×8,
=3.14×3×8,
=3.14×24,
=75.36(立方厘米).
答:这个圆锥的体积是75.36立方厘米.
收起
为你推荐: