How to use pi(π) symbol in LaTeX?

Symbol/Unicode Pi/U+03C0
Type of symbol Greek small letter
Package (requirement) No
Argument No
Latex command \pi
Example \pi → π
   \[ \pi = 3.141\dots \]
   \[ C = 2\pi r \]
   \[ A = \pi r^2 \]

Output :

Use pi symbol in latex.

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