Volume of Sphere - 4/3 Pi r^3
=> Volume of Hemisphere - 2/3 Pi r^3
Volume of Cone - 1/3 Pi r^2 h
since h=2cm r=1cm (dia 2cm)
so h=2r
=> 2/3 Pi r^3
Total Volume of Pencil -
4/3 Pi r^3
r=1cm
Pi=3.14
Total Volume of Pencil (tip and back as middle portion is not given) -
4/3 * 3.14 * 1
=> 4.18