Posted by jake on Sunday, February 6, 2011 at 10:45am.
if the diameter of a bike wheel is 20cm, what's the minimum number of revolutions needed to cover 1km?

maths  dave, Sunday, February 6, 2011 at 10:56am
1km = 1000 m
100cm = 1 m
convert to meters and divide

maths  helper, Sunday, February 6, 2011 at 11:19am
Diameter d = 20 cm
Circumference C = pi * d
C = 3.14 * 20 = 62.8 cm in one revolution
62.8 cm
100 cm = 1m
62.8/100 = 0.628 m
0.628 m in one revolution
1 km = 1000 m
1000/0.628 = 1592.36 revolutions
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