Some examples of a hollow cylinder are pipes, circular buildings and bearing bushes. If is the outside radius of the cylinder and is the inside radius of the cylinder, then
with and being the outer and inner diameter, and is volume.
A well with a 10m inside diameter is dug 14m deep. The earth taken out of it is spread all around to a width of 5m to form an embankment. Find the height of the embankment.
Volume of the dug out earth
Area of the embankment (shaded)
Height of the embankment
A hollow cylinder copper pipe is 21dm long. Its outer and inner diameters are 10cm and 6cm respectively. Find the volume of the copper used in making the pipe.
The height of the cylindrical pipe is
Volume of the copper used in making the pipe