Work out hollow cylinder volume instantly with clear inputs, formula shown and shareable results.
A hollow cylinder (pipe) is the difference of two coaxial cylinders, so the material volume is π(R² − r²)h. The annulus area π(R² − r²) is the cross-section of the wall.
Material volume
V = π(R² − r²)h
Annulus area
A = π(R² − r²)
π(25 − 9) × 12 = 192π ≈ 603.185789 cubic units of pipe wall.
No, that is a different and incorrect quantity. You must subtract the squares, not square the difference.