r= 12.56/(2*3. 14)=2

Because if the radius and height of a cone are the same as the bottom of a cylinder, its volume is 1/3 of the cylinder volume.

In this question, the height of the cone is one third of that of the cylinder, so the volume is 1/9 of the cylinder.

So the volume of this part v =10/9 * 3.14 * 2 *13.5 =188.4 (cubic centimeter).

2. The volume formula of the cone V =1/3 * 3.14 * r * r * h (r is the radius of the height of the bottom h).

Because the bottom radius of the cone in this problem is twice that of the cylinder, but the height of the cylinder is twice that of the cone.

So the volume of the cone is cylindrical (1/3)*4/2=2/3, which is 66.7%.