Question

8. The inner and outer walls of a 30 cm long
pipe have a diameter of 15 cm and I am
respectively. Find the volume of the
material used in the pipe use = 314​

Answer 1

Let outer radius is r and inner radius is s.

π = 3.14

h = 30cm

r = 15/2 = 7.5 cm

s = 1/2 = 0.5cm

$= > volume \: \: = \pi {r}^{2} h - \pi { s }^{2} h$

$= > volume \: = \pi \: h \: ( {r}^{2} - {s}^{2} )$

$= > volume \: = \pi \: h \: (56.25 - .25)$

$= > volume \: = \: 3.14 \times 30 \times 56$

$= > volume \: = \: 5275.2 {cm}^{3}$

Hence, volume of the pipe is 5275.2 cm³.

Hope this answer helps you ^_^ !