Question : If a wheel has a diameter of 42 cm, then how far does the wheel go (in metres) in 12 revolutions? (Take $\pi=\frac{22}{7}$)
Option 1: 21.45
Option 2: 23.27
Option 3: 15.84
Option 4: 17.64
Correct Answer: 15.84
Solution :
Use :
C = $\pi$ × d, where, C is the Circumference of the circle, d is the diameter
According to the question
C = $\pi$ × d = $\frac{22}{7}$ × 42 = 132 cm
$\therefore$ Total distance
= Distance per revolution × Number of revolutions
= 132 cm × 12 revolutions
= 1584 cm
= 15.84 metres
Hence, the correct answer is 15.84.
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