Q. 85.0( 1 Vote )

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
A. 1200πcm2

B. 600πcm2

C. 300πcm2

D. 600 cm2

Answer :

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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