Frustum of a Right Circular Cylinder
If is the radius and
is the height of the frustum, then:
(i) The volume of the frustum of the circular cylinder
i.e.

(ii) The curved surface area of the frustum
(iii) The total surface area = curved surface area + area of the ends
Example:
A circular cylinder having a radius of 2.3m is cut in the shape of a frustum with . Find the volume and the lateral surface area.
Solution:
(a)
(b) Curved surface area