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The volume of a right circular cone is $9240 cm^{3}$ and its base radius is 21 cm. Find its curved surface area. (Take π = 22/7)

Competition practiceMensuration

A $1914 cm^{2}$
B $3300 cm^{2}$
C $1320 cm^{2}$
D $1386 cm^{2}$

Step-by-Step Solution

h = \frac{3 \times 9240}{\frac{22}{7} \times 441} = 20

, so

l = 441 + 400 = 29

. CSA

= \frac{22}{7} \times 21 \times 29 = 1914 cm^{2}

.

Answer: A)

1914 cm^{2}

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