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To find the circumference of any circle, use the formula pi*diameter. Pi can be approximated to 3.14159. Your best bet for finding the diameter would be to set the ball down, put two books opposite each other against the ball (or anything that is a plane really) and use a ruler to measure the distance between the tops of the books. Just make sure the books (or whatever) you're using are perpendicular to the surface they're on.

If you're looking for surface area, use the formula 4*pi*r*r. To find the radius, just divide the diameter by two.

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Q: What equation do you have to do to find out the circumference of a rugby ball?
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What is the equation for finding the radius of a sphere when you know the circumference?

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