Q8 of 79 Page 245

If the circumference at the base of a right circular cone and the slant height are 120 πcm and 10 cm respectively, then the curved surface area of the cone is equal to

Base Circumference = 120π cm


Let radius be r


Base Circumference = 2πr


2πr = 120π


⇒ r = 60 cm


Slant Height (l) = 10 cm


Curved Surface Area = π×r×l


Curved Surface Area = 600π cm2


Out of all the four Options,


Correct Option :B

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