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A closed cone has radius 7 cm and slant height 10 cm. What is its total surface area? (π = $\frac{22}{7}$ )

Class 9Surface Area of a ConeMensuration

A $220 cm^{2}$
B $374 cm^{2}$
C $308 cm^{2}$
D $528 cm^{2}$

Step-by-Step Solution

TSA = π

r (l + r) = \frac{22}{7} \times 7 \times 17 = 22 \times 17 = 374 cm^{2}

. This is the curved part

220 cm^{2}

plus the base

154 cm^{2}

.

Answer: B)

374 cm^{2}

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