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Q.

Calculate the total surface area of frustum cone given below:


D = 0.4 cm, d = 0.2 cm, s = 20 cm.


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a

4.05πm2

b

5.05πm2

c

6.05πm2

d

7.05πm2  

answer is C.

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Detailed Solution

It is given,
D = 0.4 cm, d = 0.2 cm, s = 20 cm.
Total surface area = π(R+r)s+πR2+πr2  ⇒π(0.2+0.1)20+π0.22+π0.12 ⇒6π+0.04π+0.01π
⇒ 6.05πm2 Therefore, total surface area is 6.05πm2.
Hence, the correct option is 3.
 
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