Measuring Circles Using the Radius - 2.6.3

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About how many radii does it take to go halfway around the circle?
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About how many radii does it take to go all the way around the circle?
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Why doesn’t the number of radii that fit around the circumference of a circle depend on the length of the radius of the circle?
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What is the exact number of radii that fit around the circumference of the circle? Explain how you know. For a hint, type "Give me a hint!" and click "check my answer"
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A bicycle wheel has a 1 foot radius. The wheel rolls to the left (counterclockwise).
What is the circumference of the wheel when the radius is 1 foot?
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Information: Measuring Circles Using the Radius - 2.6.3