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A cone has radius 35 cm and slant height 1.2 m. What is its curved surface area in square metres? (π = $\frac{22}{7}$ )

Class 9Surface Area of a ConeMensuration

A $132 m^{2}$
B $1.32 m^{2}$
C $13.2 m^{2}$
D $0.132 m^{2}$

Step-by-Step Solution

Convert first:

r = 0.35

m. CSA =

\frac{22}{7} \times 0.35 \times 1.2 = 1.1 \times 1.2 = 1.32 m^{2}

. Mixing cm and m gives the other answers.

Answer: B)

1.32 m^{2}

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