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in Mensuration by (35.6k points)
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In a cylinder d = 40 cm, h = 56 cm, then Curved Surface Area (CSA) = ……… cm2.

A) 7040 

B) 6040 

C) 4040 

D) 3040

2 Answers

+1 vote
by (66.4k points)
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Best answer

Correct option is: A) 7040

Given that d = 40 cm

\(\therefore\) r = \(\frac d2 = \frac {40}2 = 20 \, cm\)

h = 56 cm

\(\therefore\) Curved surface area of cylinder = \(2 \pi rh\)

= 2 \(\times\) \(\frac {22}7\) \(\times\) 20 \(\times\) 56 = 44 \(\times\) 160 = 7040 \(cm^2\)

Hence, the curved surface area of cylinder is 7040 \(cm^2\)

+1 vote
by (34.5k points)

Correct option is: A) 7040

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