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The curve surface area of a cylinder, 5cm high is 110cm 2. Find the radius...

Mathematics
WAEC 2016
The curve surface area of a cylinder, 5cm high is 110cm 2. Find the radius of its base. [Take \(\pi = \frac{22}{7}\)]
  • A. 2.6cm
  • B. 3.5cm
  • C. 3.6cm
  • D. 7.0cm
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Correct Answer: Option B
Explanation
Curved surface area of cylinder = 2\(\pi\)rh

110 = 2 x \(\frac{22}{7}\) x r x 5

r = \(\frac{110 \times 7}{44 \times 5}\)

= 3.5cm
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