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Surface Areas and Volumes
RD Sharma
CBSE
Grade 10

Question:

The curved surface area of a right circular cone of radius $7\text{ cm}$ and slant height $10\text{ cm}$ is:
(a) $220\text{ cm}^2$
(b) $440\text{ cm}^2$
(c) $110\text{ cm}^2$
(d) $154\text{ cm}^2$

Step-by-Step Solution

Key Concept: $\text{CSA} = \pi r l = \dfrac{22}{7} \times 7 \times 10 = 220\text{ cm}^2$.
$\text{CSA} = 22 \times 10 = 220\text{ cm}^2$. [1.0 Mark]

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🎯 Official CBSE Marking Scheme:
Calculating CSA $= 220\text{ cm}^2$: 1.0 Mark

Correct Answer: $220\text{ cm}^2$
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