A steel pipe is 80 cm long. The outer diameter of the steel pipe is 8 cm and the inner diameter is 6 cm. How many cubic centimeters is the volume of the steel pipe Cut a cube with an edge length of 6 decimeters into the largest cylinder, and the cut part is () cubic decimeters A cylindrical reservoir can store 40 cubic meters of water. After reconstruction, the height of the reservoir remains unchanged, and the perimeter of the bottom surface is increased by three times. Now the reservoir can store () cubic meters of water

A steel pipe is 80 cm long. The outer diameter of the steel pipe is 8 cm and the inner diameter is 6 cm. How many cubic centimeters is the volume of the steel pipe Cut a cube with an edge length of 6 decimeters into the largest cylinder, and the cut part is () cubic decimeters A cylindrical reservoir can store 40 cubic meters of water. After reconstruction, the height of the reservoir remains unchanged, and the perimeter of the bottom surface is increased by three times. Now the reservoir can store () cubic meters of water

Volume v = π (R × R-R × R) H = 3.14 × (64-36) × 80 = 6531.2 cm3

2. An 80 cm long steel pipe has an inner diameter of 8 cm and an outer diameter of 10 cm. What is the volume of steel used in this steel pipe?

Floor area
=Circle area
=π*(R*R-r*r)
volume
=Bottom area * height
=π*(R*R-r*r)*h
=3.14*((10/2)*(10/2)-(8/2)*(8/2))*80
=2260.8 cm3

The outer diameter of a steel pipe is 10 cm, the inner diameter is 8 cm, and the pipe length is 8 decimeters. How many cubic centimeters is the volume of this steel pipe?

The outer radius of the steel pipe is 5cm and the inner radius is 4cm
Cross sectional area of pipe = 3.14x5x5-3.14x4x4 = 28.26 square centimeter
Volume = tube cross section x tube length = 28.26x80 = 2260.8 cm3