1.v=1/3 pi*r^2 *h
=1/3*3.14*4^2*5
=83.78cm^3
2.v=v
1/3 pi*r^2 *h=5*.02*x
1/3*3.14*(6.28/6.28)^2*1.2=.1x
x=12.56m(12.57如果pi取精确值)
3.v=v
42.39=1/3 pi*r^2 *h
42.39=1/3*3.14*(12/2)^2*h
h=1.12dm
4.v=1/3 pi*r^2 *h
=1/3*3.14*2^2*15
=62.8cm^3
1.v=1/3 pi*r^2 *h
=1/3*3.14*4^2*5
=83.78cm^3
2.v=v
1/3 pi*r^2 *h=5*.02*x
1/3*3.14*(6.28/6.28)^2*1.2=.1x
x=12.56m(12.57如果pi取精确值)
3.v=v
42.39=1/3 pi*r^2 *h
42.39=1/3*3.14*(12/2)^2*h
h=1.12dm
4.v=1/3 pi*r^2 *h
=1/3*3.14*2^2*15
=62.8cm^3