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variable pi formula
Diameter (mm) = 0.0000003 : (pi of D - 3.1416 )^2
Pi of D is variable from 3.1416 to 3.1589
Pi min = 3.1416
Pi max = 3.164
When pi of D = 3.1416 , D = infinite mm
When pi of D = 3.1589 , D = 0.001mm
When pi of D = 3.14161 , D = 3000mm
Diameter (mm) = 0.0000003 : (pi of D - 3.1416 )^2
Pi of D is variable from 3.1416 to 3.1589
Pi min = 3.1416
Pi max = 3.164
When pi of D = 3.1416 , D = infinite mm
When pi of D = 3.1589 , D = 0.001mm
When pi of D = 3.14161 , D = 3000mm