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Curved Surface area of a right circular cylinder

Question

The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to____ $(m m)^{2}$

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Solution

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Total surface area $S = 2 π r h + 2 π r^{2}$

$⟹ S = 2 π r (r + h) = 2 \times 3.1416 \times 2 \times 12$

$⟹ S = 150.8 c m^{2}$

$⟹ S \approx 1.51 \times 10^{4} m m^{2}$

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