The question is in really bad english, but I'm guessing your meant:
'How do I work out the diameter using pi?'
Diameter= Radius2
You don't need to use Pi to work out the diameter.
Unless you have a question that doesn't show you the radius.
Then you do Area divided by Pi which equals the Diameter.
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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.