Raghu wants to make a closed aluminium cone for his science project. The slant

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Raghu wants to make a closed aluminium cone for his science project. The slant height and radius of the cone should be 10 cm and 7 cm respectively. The area of the aluminium sheet required to make the cone is_____.
$(U s e π = \frac{22}{7})$

Options:

A .

400 {c m}^{2}

B .

267 {c m}^{2}

C .

258 {c m}^{2}

D .

374 {c m}^{2}

Answer: Option D
:
D

Given,
Radius $(r)$ = 7 $cm$
Slant height $(l)$ = 10 $cm$

Area of the aluminium sheet required
=Total surface area of the cone
= $π r (l + r)$
= $\frac{22}{7} \times 7 (10 + 7)$
= 374 ${cm}^{2}$
Hence, the area of the aluminium sheet required is 374 ${cm}^{2} .$

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