The curve surface area of a cylinder, 5cm high is 110cm 2 . Find the
MATHEMATICS
WAEC 2016
The curve surface area of a cylinder, 5cm high is 110cm2. Find the radius of its base. [Take \(\pi = \frac{22}{7}\)]
- A. 2.6cm
- B. 3.5cm
- C. 3.6cm
- D. 7.0cm
Correct Answer: B. 3.5cm
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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