A bicycle wheel of radius 42cm is rolled over a distance 66 meters. How many
MATHEMATICS
WAEC 2000
A bicycle wheel of radius 42cm is rolled over a distance 66 meters. How many revolutions does it make?[Take π = 22/7]
- A. 2.5
- B. 5
- C. 25
- D. 50
Correct Answer: C. 25
Explanation
circumference of the bicycle wheel
\(= 2\pi r = 2 \times \frac{22}{7} \times 42 - 264cm = 2.64m\\\)
Number of revolution
\(=\frac{66}{2.64} = 25\)
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