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
waec 2016mathematics

The correct answer is B. 3.5cm

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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