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Python | cmath.pi constant
• Last Updated : 09 Sep, 2019

With the help of `cmath.pi` constant, we can use this constant value in the calculation of area of circle, perimeter of circle and etc.

Syntax : `cmath.pi`
Return : Return the pi value.

Example #1 :
In this example we can see that by using `cmath.pi` constant, we are able to drive the mathematical formulas very easily.

 `# importing cmath library``import` `cmath`` ` `r ``=` `5``# using cmath.pi constant``gfg ``=` `cmath.pi ``*` `r``*``r`` ` `print``(gfg)`

Output :

78.53981633974483

Example #2 :

 `# importing cmath library``import` `cmath`` ` `r ``=` `3``# using cmath.pi constant``gfg ``=` `2` `*` `cmath.pi ``*` `r`` ` `print``(gfg)`

Output :

18.84955592153876

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