Question

a lead pencil consist of a cylinder of wood with solid cylinder of graphite filled in the interior the diameter of the pencil is 7mm and the diameter of the graphite is 1mm if the length of the pencil is 14cm find the volume of the wood and that of the graphite

Answer 1

diameter of wood = 0.7 cm
length = 14 cm
$volume \: = \pi \: {r}^{2} h \\ \frac{22}{7} \times 0.7 \times 0.7 \times 14 \\ 21.56 \: cm^{3}$

diameter of graphite = 0.1 cm
length = 14 cm
$volume \: = \pi {r}^{2} h \\ \frac{22}{7} \times 0.1 \times 0.1 \times 14 \\ 0.44 {cm}^{3}$
hope it helps

Answer 2

this is the answer of your question