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The height of a cylinder is 80 cm and the diameter of its base is 7 cm. The whole surface area of the cylinder is
(a) 1837 cm²
(b) 1760 cm²
(c) 1942 cm²
(d) 3080 cm²

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Solution

(a) 1837 cm²
Diameter = 7 cm
Radius =3.5 cm
Height = 80 cm
∴ Total surface area $= 2 πr (r + h) = 2 \times \frac{22}{7} \times 3.5 (3.5 + 80) = 22 (83.5) = 1837 {cm}^{2}$

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