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NCERT Exemplar Solutions Class 9 Mathematics Solutions for Surface Areas and Volumes - Exercise 13.1 in Chapter 13 - Surface Areas and Volumes
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Question 5 Surface Areas and Volumes - Exercise 13.1
The total surface area of a cone whose radius is r/2 and slant height 2l is
Answer:
(B) πr(l+(r/4))
Explanation:
Given, radius of a cone is r/2 and slant height is 2L.
Total surface area = π × radius × slant height + π × radius2
\begin{array}{l} =\pi \times \frac{r}{2} \times 2 \times 1+\pi \times\left(\frac{r}{2}\right)^{2} \\ =\pi r l+\frac{\pi r^{2}}{4} \\ =\pi r\left(1+\frac{r}{4}\right) \end{array}
Hence, option B is the correct answer
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