Question

Curved surface area of cylinder with diameter 21 cm and height 42 cm is

A. 5544 sq. cm


B. 5544 cu. cm


C. 2272 cu. cm


D. 2272 sq. cm

Answer 1

I hope it helps

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Answer 2

Answer :

2772 cm^2

Given :

• The diameter of a cylinder = 21 cm
• The height of the cylinder = 42 cm.

To Find :

• Curved surface area of the cylinder = ?

Solution :

Using Formula : Curved surface area of a cylinder = 2πrh

We have -

• Radius (r) = D/2 = 21/2 cm.
• Height (h) = 42 cm.

$\longrightarrow \sf{CSA = \cancel{2} \times \dfrac{22}{\cancel{7}}\times \dfrac{21}{\cancel{2}}\times \cancel{42}} \\ \\ \longrightarrow \sf{CSA = 22 \times 21 \times 6}\\ \\ \longrightarrow \sf{CSA = 2772 \; cm^{2}}$

• Hence, the curved surface area of the cylinder = 2772 cm^2

and, Non of the option is correct.