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Q.

A joker’s cap is in the form of a right circle cone of base radius 7cm and height 24cm. Find the area of the sheet required to make 10 such caps.


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a

5500cm. square

b

5000cm. square

c

3000cm .square

d

1000cm .square 

answer is A.

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Detailed Solution

r = 7 cm, h = 24 cm
l=r2+h2=72+242=25 cm
curved surface area of the cap = πrl=227×7×25=550 cm2
the sheet required to manufacture ten caps is the multiple of 10 to the sheet required for one cap.
10×550=5500 cm2
Hence, Option (1) is the correct answer.
  
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