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Q.

The radius and height of a right solid circular cone (ABC)   are respectively 6 cm   and 2 7  cm  . A coaxial cone (DEF)  of radius 3 cm   and height 7   cm   is cut out of the cone as shown in the given figure. Then what is the whole surface area of the solid thus formed?


Question Image

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a

60π cm 2  

b

87π cm 2  

c

96π cm 2  

d

198  cm 2   

answer is B.

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Detailed Solution

Given- radius is 6 cm   and height is 2 7  cm   for cone ABC, radius is 3 cm   and height is 7   cm  for cone DEF.
Question ImageThus, whole surface area of the solid is 87π cm 2  .
Therefore, option 2 is the correct option.
 
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