It is not.
[math]1[/math] is not [math]2.54[/math], though [math]1[/math] inch is [math]2.54[/math]cm.
[math]\pi[/math] is just a number, with no units of measurement (it is "dimensionless"). Just like [math]7[/math] or [math]\sqrt{2}[/math], it's not the length or the size or the weigh...
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