Question

A child rolls a ball on a level floor 3.2 m to another child. if the ball makes 16.0 revolutions, what is its diameter?

Answer 1

Total distance = 3.2m

Total Revolution = 16.0

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Find Distance for 1 revolution :
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Distance per revolution = 2.3 ÷ 16 = 0.2 m


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Find Diameter :
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Given that circumference of a circle is πD:

πD = 0.2

D = 0.2 ÷ π .  \\ Using calculator π

D = 0.06m (Nearest hundredth)

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Answer: The diameter is 0.06m.
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