Get premium membership and access revision papers with marking schemes, video lessons and live classes.
The figure below represents a hollow cylinder.The internal and external radii are estimated to be 6 cm and 8 cm respectively ,to the nearest whole number.The height of the cylinder is exactly 14 cm
![hollow.png](/courses/uploads/hollow.png)
(a) Determine the exact values for internal and external radii which will give maximum volume of the material used.
(b) Calculate the maximum possible volume of the material used. ( Take the value of #pi# to be #22/7# )