The answer depends on what the ratio is relative to!
The ratio of a circumference to the area of a circle is half the radius.
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For any circle in a plane, the ratio of circumference to diameter is a number called pi, approximately 3.14.
Since pi is the ratio of a circle's circumference to its diameter, multiply the diameter by pi (about 3.14159) to get the circumference.
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)