Question

Graphite lead diameter of 1mm is inserted in a pencil with base diameter 7mm. If length of 14cm, find volume of wood and volune of graphite

Answer 1

volume of graphite =22/7*1/2*1/2*14
                               =11 cubic cm
volume of wood=22/7(7/2+1/2)(7/2-1/2)
                         =22/7*8/2*6/2
                         =22/7*4*3
                         =37.68 cubic cm