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An ice-cream wafer cone has radius 2.1 cm and slant height 5 cm. How much wafer is used for one cone? (π = $\frac{22}{7}$ )

Class 9Surface Area of a ConeMensuration

A $46.86 cm^{2}$
B $66 cm^{2}$
C $33 cm^{2}$
D $13.86 cm^{2}$

Step-by-Step Solution

Only the curved surface is wafer:

\frac{22}{7} \times 2.1 \times 5 = 6.6 \times 5 = 33 cm^{2}

. (46.86 adds the base

13.86 cm^{2}

, which is open.)

Answer: C)

33 cm^{2}

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