It is pi because a circle's circumference divided by its diameter is the value of pi which is an irrational number that can't be expressed as a fraction.
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ratio of circumference to diameter of a circle is 3.14159265:1
The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
diameter to radius ratio (for same circle) is 2:1
C = pi x D is the ratio of a circle's circumference to its diameter.