How to use pi(π) symbol in LaTeX?

Symbol/UnicodePi/U+03C0
Type of symbolGreek small letter
Package (requirement)No
ArgumentNo
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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