WAEC - Mathematics (2000 - No. 39)
A bicycle wheel of radius 42cm is rolled over a distance 66 meters. How many revolutions does it make?[Take \(\pi = \frac{22}{7}\)]
2.5
5
25
50
설명
circumference of the bicycle wheel
\(= 2\pi r = 2 \times \frac{22}{7} \times 42 = 264cm = 2.64m\\\)
Number of revolution
\(=\frac{66}{2.64} = 25\)
\(= 2\pi r = 2 \times \frac{22}{7} \times 42 = 264cm = 2.64m\\\)
Number of revolution
\(=\frac{66}{2.64} = 25\)