Question : The curved surface area of a cone whose base radius is 7 cm and slant height is 10 cm is:
Option 1: 280 cm2
Option 2: 250 cm2
Option 3: 300 cm2
Option 4: 220 cm2
Correct Answer: 220 cm 2
Solution : Give: Radius = 7 cm Slant height = 10 cm The curved surface area of a cone = $\pi rl$ = $\frac{22}{7}\times7\times10$ = 220 cm 2 Hence, the correct answer is 220 cm 2 .
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