Question

The thickness of a hollow metallic cylinder is 2 cm. It is 35 cm long and its
radius is 12 cm. Find the volume of metal required to make the cylinder, assuming
it is open, at either end.​

Answer 1

Answer:

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Answer 2

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1. thickness of hollow cylinder is 2 cm
2. length=35cm
3. Inner radius=12cm
4. outer radius=12+2=14cm

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volume volume of wood required to make the cylinder = volume of whole cylinder - volume of hollow cylinder.

$\pi \times {r}^{2} \times h - \pi \times {r}^{2} \times h$

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

$= \frac{22}{7} ( {14}^{2} - {12}^{2} )35$

$= \frac{22}{7} (196 - 144)35$

$= \frac{22}{ \cancel7} \times 52 \times \cancel35$

$= 22 \times 52 \times 5$

$= 5720 {cm}^{3}$

$\bf{hope \: this \: helps \: you }$