Question

The height of a right circular cone is 21 cm and the diameter of the base 2r cm then its volume

Answer 1

#HEY MATE#
radius = r cm
height = 21 cm 
Vol. of cone = 1/3 pie r^2 h
                    = 1/3 (22/7) r^2 (21)
                    =22 r^2 cm^3
                               #$amu#