A) 5 : 6
B) 3 : 4
C) 4 : 5
D) 2 : 3
Correct Answer: A
Solution :
[a] Let radii of first and second cylinders be 2r and 3r, respectively and their heights be 5h and 4h, respectively. Then, ratio of their curved surface area \[=2\pi \,(2r)\times 5h:2\pi \,(3r)\times 4h\] \[=10:12=5:6\] |
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