Question

The internal and external radii of a hollow cylinder are 12 cm and 18 cm respectively. If its height is 14 cm, then find its curved surface area.
Jus answer needed to check

Answer 1

Solution:

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Given:

Radii of hollow cylinder is12cm & 18cm,.

R = 18 cm,

r = 12 cm,

Height of the cylinder = 14cm,.

h = 14 cm,
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To find :

CSA of Hollow cylinder,.

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We know that,

CSA of hollow cylinder = 2πrh + 2πRh

=> 2π(R + r) h

=> $2( \frac{22}{7} ) 14( 18 + 12)$

=> 2(22)(2)(30)

=> 4(22)(30)

=> 88(30)

=> 2640 cm².

 ∴ CSA of the given hollow cylinder is 2640cm².
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