PowerTip: Display the Value of Pi to Three Decimal Places – Hey, Scripting Guy! Blog
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Summary: Use Windows PowerShell to display the value of Pi to three decimal places.
 How can I display the value of Pi to three decimal places by using conditional formatting to avoid rounding numbers up or down?
 Use the  Fixed-Point (“F”) Format Specifier , and specify the number of desired decimal places. The following technique uses the Windows PowerShell format operator.
PS C:\> “{0:F3}” -f [math]::PI
3.142