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: $66 \pi \;{cm}^2$
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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