Elementary school mathematics. Calculate the volume of a shape. How to calculate? The second column is missing a bottom! Please, everybody, hurry up! ! !

Hello, the volume of cylinder is: bottom area * height, and the volume of cone is: 1/3* bottom area * height.

Question 1: Volume =1/3 * π * (square of 7) * 12 = 6 15.44 cubic centimeters.

The second problem is that the cylinder is like a steel pipe, and the bottom area on the other side is the same as that on the left.

The volume of steel pipe is required, so the volume is π * (the square of 5) * 30-π * (the square of 4) * 30 = 847.8 cubic centimeters.

1.2 1 year model essay for the first semester of senior high school physics teaching plan

I. Guiding ideology