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
\documentclass{article}
\begin{document}
   $$ \pi = 3.141\dots $$
   $$ C = 2\pi r $$
   $$ A = \pi r^2 $$
\end{document}

Output :

Use pi symbol in latex.

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