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The radius and height of a right solid circular cone $(A B C)$ are respectively $6 cm$ and $27 cm$ . A coaxial cone $(D E F)$ 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?

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60 π cm 2

87 π cm 2

96 π cm 2

198 cm 2

answer is B.

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Detailed Solution

Given- radius is

6 cm

and height is

27 cm

for cone ABC, radius is

3 cm

and height is

7

cm

for cone DEF.
Question Image

Thus, whole surface area of the solid is

87 π cm 2

.
Therefore, option 2 is the correct option.

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