Question 934670: A bicycle wheel has a radius of 40 cm. how many times does it revolves during a journey of 10 km?
Answer by Theo(13342)   (Show Source):
You can put this solution on YOUR website! circumference = 2*pi*r = 2*pi*40 centimeters = 80 * pi centimeters = 251.3274123 centimeters
1 km = 1000 meters.
1 meter = 100 centimeters.
1 km = 1000 * 100 = 100,000 centimeters.
10 km = 10 * 100,000 = 1,000,000 centimeters.
1,000,000 centimeters divided by 251.3274123 centimeters for each revolution of the bicycle wheel = 3978.873577 revolutions of the bicycle wheel.
each revolution of the wheel is 251.3274123 centimeters long.
251.3274123 * 3978.873577 revolutions equals a total distance of 1,000,000 centimeters.
1,000,000 centimeters equals 10 kilometers.
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