Question

A 14cm long electric pole has external and internal radii.as 5cm and 3cm.find the volume of the electric pole

Answer 1

HeY MatE !!
HERE is YOUR answer------


Height of electric pole = 14 cm

External radius ( R ) =
$5 \: cm$


Internal radius ( r ) =
$3 \: cm$

therefore,

$volume \: of \: outer \: electric\: pole \: - volume \\ of \: inner \: electric \: pole \\ \\ = \pi {R}^{2}h \: - \: \pi {r}^{2}h \\ = \pi(R {}^{2} - {r}^{2} )h \\ \\ = \frac{22}{7} ( {5}^{2} - {3}^{2} )14 \\ \\ = 22(5 + 3)(5 - 3) \\ \\ =44( \: 8 \times 2) \\ \\ = 44 \times 16 \\ = 704 \: {cm}^{3}$
so , volume of electric pole is 704 cm³