what is the diameter of a wheel that makes 9 revolutions and travels 50 feet?

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Since 50 feet = 9 revolutions, then 50 feet = 9 x Circumference.  Hence the Circumference = 50/9

C = pi x Diameter, so substitue and solve for D.

50/9 = pi x D

50/9pi = D

Not sure what, if any, approximation you are supposed to use for pi.  But, you can plug that number in to get the approximate diameter.

 

Hope that helps!
by Level 1 User (240 points)

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