The volume of a right circular cone is one-third of the volume of a right circular cylinder of the same base and same height.
             If  is the height of the cone, is the radius of the base, then
                       
                                  (as area of base )

Rule: The volume of a cone equals the area of the base times one-third the altitude.

Example:
            The circumference of base of a m high conical tent is m. Find the volume of the air contained in it.
Solution:
            Circumference of the base m
                   
                        m
             Height of the conical tent m
             Volume of air
                                        Cubic m

Example:
            The vertical height of a conical tent is dm and the diameter of its base is m. Find the number of persons it can accommodate if each person is to be allowed  Cubic dm of space.
Solution:
            Here height dm
            Diameter         m dm
            Radius,         dm
                       
            Volume
                         
                           Cubic dm
            Space allowed for  person  Cubic dm
             Required number of persons  Persons