请教圆柱的底面周长是1.57M,高是0.7M,求体积.用方程解答.

问题描述:

请教圆柱的底面周长是1.57M,高是0.7M,求体积.用方程解答.
请教一个圆柱的底面周长是1.57M,高是0.7M,求体积.用方程解答.急`````````

设底面半径是r米
2*3.14r=1.57
r=1/4
3.14*(1/4)^2*0.7=0.137375立方米