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Q.

The height of a right circular cylinder with lateral surface area 792  cm 2  is 21 cm  . What is the diameter of its base?


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a

10 cm

b

12 cm

c

16 cm

d

20 cm 

answer is B.

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Detailed Solution

Given- lateral surface area = 792  cm 2  , height = 21cm.
Lateral surface area of cylinder =2πrh  
792=2 22 7 (r)(21) 792 = 924 7 r r = 792×7 924 r = 6 cm  
Diameter = 2×6=12  cm.
Thus, the diameter of its base is 12 cm.
Hence, option 2 is the correct option.
 
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