Question 245878: A bicycle tire has a diameter of 66 centimeter. Approximately how many times must the tire rotate to travel 1 kilometer?
(A) 5 (B) 10 (C) 48 (D) 480 (E) 960
Answer by unlockmath(1688)   (Show Source):
You can put this solution on YOUR website! Hello,
First, let's establish the formula for the circumference of a circle. Its:
C=pi times diameter Now we can plug in the numbers:
C=3.14*66 Do the calculations
C=207.24 cm for one rotation of the tire.
Now we need to figure how many centimeters are in 1 Kilometer. There are 1000 meters in a kilometer and 100 centimeters in a meter so we multiply 1000*100 will give us:
100,000 centimeters So we divide 207.24 into that to give us:
482.53 times to rotate. Round this off and we get the answer of:
480 times.
Did this make sense to you?
RJ Toftness
check out a new book at www.math-unlock.com
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