GRE Math Review 3 GEOMETRY

The ratio of the circumference C to the diameter d is the same for all circles and is denoted by the Greek letter pi; that is, C over d = pi. The value of pi is approximately 3.14 and can also be approximated by the fraction 22 over 7. If r is the radius of a circle, then C over d = C over 2r = pi, and so the circumference is related to the ... ................
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