Question : If the slant height of a cone is 60 cm and the radius of its base is 21 cm, then find its curved surface area is? (use $\pi=\frac{22}{7}$)
Option 1: 3880 cm2
Option 2: 3820 cm2
Option 3: 3960 cm2
Option 4: 4020 cm2
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Correct Answer: 3960 cm 2
Solution : The slant height of a cone, $l$ = 60 cm The radius of the base, $r$ = 21 cm Curved surface area = $\pi\times r\times l$ Or, curved surface area = $\frac{22}{7}\times 60\times 21$ cm 2 $\therefore$ Curved surface area = 3960 cm 2 Hence, the correct answer is 3960 cm 2 .
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