高=6.28÷6.28=1米地面直径=6.28÷3.14=2半径=2÷2=1体积=3.14✘1✘1✘1=3.14
圆柱底面半径：r=6.28/2*PI=1M圆柱高：h=6.28/6.28=1M圆柱体积：PI*r^2*h=3.14M^3
