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The slant height of a right circular cone is 10 m and its height is 8 m. Find the area of its curved surface.

30Π m2
40Π m2
60Π m2
80Π m2

Correct Answer: 60Π m2

Explanation:

l = 10 m,

h = 8 m.

So, r = √l² - h² = √(10)² - 8² = 6 m.

∴ Curved surface area = Πrl = (Π x 6 x 10) m² = 60Π m².

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