How to denote angle(∠) symbol in LaTeX?

In latex, the angel command is used by default to represent angel symbols. And angel command is the best practice for this symbol.

\documentclass{article}
\begin{document}
  $$ \angle $$
  $$ \angle{ABC} $$
\end{document}

Output :

angle symbol

And this angel command is also present in the asmsymb package.

\documentclass{article}
\usepackage{amssymb}
\begin{document}
  $$ \angle{PQR} $$
\end{document}

Output :

angle symbol

This symbol is represented in two more ways according to the shape of the angle.

1. Measure angel in LateX

Measure angle symbol is used to represent the size of angle. And this symbol is represented by the \measuredangle command that is present in both the amssymb and mathabx packages.

\documentclass{article}
\usepackage{amssymb}
\begin{document}
  $$ \measuredangle{PQR}=30^{\circ} $$
\end{document}

Output :

Measure angle symbol

And if you use the same command with mathabx package, there will be a slight difference in the shape of the symbol.

\documentclass{article}
\usepackage{mathabx}
\begin{document}
  $$ \measuredangle{PQR}=45^{\circ} $$
\end{document}

Output :

Measure angle symbol

2. Spherical angel in LaTeX

There are no specific commands or packages to represent spherical angels. You can use more than one package and command. Notice this table below

amssymb \sphericalangleSpherical angel symbol with amssymb package
wasysym \varangle → Spherical angel symbol with wasysym package in latex
mathabx \sphericalangleSpherical angel symbol with mathabx package
marvosym \anglesignSpherical angel symbol with mathabx package
\documentclass{article}
\usepackage{amssymb,wasysym}
\begin{document}
   $$ \sphericalangle ABC $$
   $$ \varangle PQR $$
\end{document}

Output :

Spherical angel in LaTeX

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