Given: The height of the cone is 12 cm.

The radius of the cone is 5 cm.

Curved surface area of a cone is : πrl (here r and l are radius and slant height respectively)

l = √(r2 + h2)

πrl = πr√(r2 + h2)

Let S be the CSA of the cone.

S = πr√(r2 + h2)

S = π × (5) × √((5)2 + (12)2)

S = π × (5) × √(25 + 144) = π × (5) × √(169)

S = π × (5) × 13 = 65π

S = 65π cm2

That is CSA of the cone is 65π cm2

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