Find the curved surface area of a cone (in cm²) whose base diameter is 30 cm, and the height is 20 cm. (π = 3.14)
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Correct answer: B
Explanation
The correct answer is option 2 i.e 1177.5.
Diameter = 30 cm → Radius = 15 cm
Height = 20 cm
l = √(15² + 20²) = √(225 + 400) = √625 = 25 cm
Curved Surface Area = π × radius × slant height = 3.14 × 15 × 25 = 1177.5 cm²