MathematicsA 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.

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.


  1. A
    5500cm. square
  2. B
    5000cm. square
  3. C
    3000cm .square
  4. D
    1000cm .square 

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    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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