A lead pencil consists of a cylinder of wood with solid cylinder of graphite filled in the interior The - Maths - Surface Areas and Volumes

Question

A lead pencil consists of a cylinder of wood with solid cylinder
of graphite filled in the interior The diameter of the pencil is 7
mm and the diameter of the graphite is 1 mm If the length of the
pencil is 14 cm, find the volume of the wood and that of the
graphite

Gopal Mohanty · Accepted Answer

Radius (r1) of pencil =

= 0 35 cm Radius (r2) of graphite =

= 0 05 cm Height (h) of pencil = 14 cm Volume of wood in pencil =

A lead pencil consists of a cylinder of wood with solid cylinder of graphite filled in the interior. The diameter of the pencil is 7 mm and the diameter of the graphite is 1 mm. If the length of the pencil is 14 cm, find the volume of the wood and that of the graphite.