Discussion
What is the curved surface area of a cone whose radius is 7 cm and slant height 10 cm ? (Take \(\pi = 22/7\))
Answer: A
Correct answer: 220 sq. cm
\[\text{Curved surface area} = \pi r l = \frac{22}{7} \times 7 \times 10 = 220 \text{ sq. cm}\]
Adding the base, \(\pi r^2 = 154\) sq. cm, would give a total surface area of 374 sq. cm, so read carefully which is asked.
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