Question : The radius of a cylinder is 14 cm. If the height of the cylinder is four times of its radius, then what is the curved surface area of the cylinder?
Option 1: 5546 cm2
Option 2: 4928 cm2
Option 3: 4694 cm2
Option 4: 5214 cm2
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Correct Answer: 4928 cm 2
Solution : Given that: $r= 14$ cm and $h = 4r= 4 × 14 = 56$ cm $\therefore$ Curved surface of the cylinder = $2\pi r h=2 \times \frac{22}{7} \times 14 \times 56 = 4928$ cm 2 Hence, the correct answer is 4928 cm 2 .
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