Thread: Mass of Cylinder

Question 1
internal radii of hollow metal cylinder = 5 cm
external radii of hollow metal cylinder= 6 cm
Length= 2.4 meter
Density= 7.6 g/cm^3

Mass of Cylinder ?

area or mass of a cylinder is pi x radius^2
density= mass x volume
But how to use the two radii. shoule radius used be 6cm+5cm=11cm ?

To find the area of the cross section, subtract the area of the smaller circle from that of the larger circle.

Volume of a cylinder - Math Open Reference