Discussion
The curved surface area of glass having radii 3 cm and 4 cm respectively and slant height 10 cm is
Answer: C
A glass with two different circular ends is a frustum, whose curved surface area is
\[ \text{CSA} = \pi (R + r) l \]
\[ = \frac{22}{7} \times (4 + 3) \times 10 = \frac{22}{7} \times 7 \times 10 \]
\[ = 220 \text{ cm}^{2} \]
It is the sum of the radii that enters here, not the difference - the difference appears only when finding the slant height from the vertical height.
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