Question : The slant height and the radius of a right circular cone are 11 cm and 6 cm, respectively. What is the curved surface area of the cone?
Option 1: $74 \pi\; {cm}^2$
Option 2: $60 \pi \;{cm}^2$
Option 3: $44 \pi\; {cm}^2$
Option 4: $66 \pi \;{cm}^2$
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Correct Answer: $66 \pi \;{cm}^2$
Solution : Given, The slant height of the cone = 11 cm The radius of the cone = 6 cm The curved surface area of a cone = πrl, where r is the radius and l is the slant height of the cone. = $π$ × 6 × 11 = 66$π$ cm 2 Hence, the correct answer is $66 \pi \;{cm}^2$.
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Question : The curved surface area of a right circular cone is 44 cm². If the slant height of the cone is 7 cm, then find the radius of its base. [Use $\pi=\frac{22}{7}$ ]
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Question : The curved surface area is thrice as big as the base area of a cone. If the diameter of the cone is 1 cm. Then what is the total surface area (in cm2) of the cone?
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Question : What will be the curved surface area of a cone of radius 5 cm and a slant height of 30 cm? (Use $\pi=3.14$)
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