Question

the radius of the base of cone is 9cm and it's height is 12cm find the curved surface area of a cone​

Answer 1

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Answer 2

Given : h= 12cm r=9cm

Sol: l^2=h^2 +r^2

l^2= 12^2 + 9^2

l^2= 144 + 81

l^2= 225

l = 15cm

C.S.A= pie×r×l

= 22/7 × 9 × 15

= 2970/7

= 4252.75cm^2