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Excel PI Function

Excel PI function
Summary 

The Excel PI function returns the value of pi. For example, the formula =2*PI() * 3 returns the circumference of a circle with a radius of 3.

Purpose 
Get the value of π
Return value 
3.14159265358979
Syntax 
=PI ()
Arguments 
Usage notes 

The return value, 3.14159265358979, is accurate to 15 digits. Here are a few formula examples:

=PI()
=PI()/2
=2*PI()*r

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