The curved surface area of a cone of slant height l and radius r is given by (1) 1/3 pi r^2 (2) pi rl (3) pi rl^2 (4) 1/3 pi rl

Answer: (2)

Given parameters

Radius of the cone = r

Slant height of cone = l

Curved surface area (CSA) = (Arc length of sector/Circumference of the circle)×Area of circle Curved surface area

CSA = (2πr/2πl) × pi;l2

CSA = πrl

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