Circumference of a circle is given by pie multiplied by the diameter.

in this case

pie times diameter = 7.7

diameter = 7.7 / pie

you are asked to find the radius

radius is half diameter

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- November 12th 2009, 10:47 AM #1

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- November 12th 2009, 10:57 AM #2

- November 12th 2009, 11:21 AM #3