Pi is a number, approximately equivalent to 3.14159, or to (22/7) within less than 1%.
Pi is the ratio of a circle's circumference to its diameter.
Pi itself has no diameter, or any dimensions at all for that matter. It's simply a dimensionless number.
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0.7161972439135291... Circumference = pi*diameter which yields circumference/pi = diameter 2.25/pi = diameter 2.25/pi = 0.7161972439135291...
Circumference = Pi x Diameter (Pi equals 3.14)
The number pi can be defined as: pi = circumference / diameter. Solving for diameter: diameter = circumference / pi. Pi is approximately 3.14.
Circumference of a circle: pi times diameter
the diameter mutliplied by pi is the circumference. From a different view the circumference divided by diameter is pi.