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A cone's base has area $154 cm^{2}$ and its slant height is 15 cm. Find its curved surface area. (π = $\frac{22}{7}$ )

Class 9Surface Area of a ConeMensuration

A $2310 cm^{2}$
B $165 cm^{2}$
C $330 cm^{2}$
D $484 cm^{2}$

Step-by-Step Solution

π

r^{2} = 154

→

r^{2} = 49

→

r = 7

cm. CSA =

\frac{22}{7} \times 7 \times 15 = 330 cm^{2} . (484 cm^{2}

is the total surface area.)

Answer: C)

330 cm^{2}

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