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Question

The cost of painting the curved surface area of a cone at 5 ps/cm2 is Rs35.20, find the volume of the cone if its slant height is 25cm.
  1. 1323 cm3
  2. 1332 cm3
  3. 1223 cm3
  4. 1979 cm3

A
1223 cm3
B
1979 cm3
C
1323 cm3
D
1332 cm3
Solution
Verified by Toppr

Curved surface area of cone painted =35.200.05=704cm2.

πrl=704cm2r=704×722×25=8.96cm9cm.

Now, h=l2r2=(25)2(9)2=62581=544=23.32cm.

Therefore, Volume of cone =13πr2h=13×227×9×9×23.32=1979cm3.

Hence, option B is correct.

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