Obtuse Angle In Latex 1 B

1. Type this following latex code in the latex editor:
   % !TEX TS-program=pdflatex
   % !TEX encoding=UTF-8 unicode
   % Description:
   % Obtuse Angle = Detuse Angle
   \documentclass[a4paper]{article}
   \usepackage{tikz}
   \usetikzlibrary{calc}
   \usepackage{bm}
   \usepackage[active,tightpage,tikz]{preview}
   \PreviewEnvironment{tikzpicture}
   \setlength\PreviewBorder{0.25pt}
   
   \begin{document}
   %Requires \usetikzlibrary{calc} in the preamble
   \boldmath
   \begin{tikzpicture}[thick]
   \coordinate (B) at (2.345,-1.234);
   \coordinate (A) at (0,0);
   \coordinate (C) at (-2.1,3.2);
   \draw [solid, thick] (B)--(A)--(C);
   \draw (A) node[below] {$A$};
   \draw (B) node[below] {$B$};
   \draw (C) node[below left] {$C$};
   % label the angle subtended at p1 by p2 and p3
   \def\angleRadius{30pt}
   % draw the arc
   % draw in Old Version Tikz/PGF
   % \draw[red,->,thick] let \p1=(A), \p2=(B), \p3=(C),
   % \n1={atan2(\x2-\x1,\y2-\y1)}, \n2={atan2(\x3-\x1,\y3-\y1)} in
   % ($(\p1)!\angleRadius!(\p2)$) arc (\n1:\n2:\angleRadius);
   % draw in Current Version Tikz/PGF
   \draw[red,->,thick] let \p1=(A), \p2=(B), \p3=(C),
   \n1={atan2(\y2-\y1,\x2-\x1)}, \n2={atan2(\y3-\y1,\x3-\x1)} in
   ($(\p1)!\angleRadius!(\p2)$) arc (\n1:\n2:\angleRadius);
   % draw the label
   \draw[red] let \p1=(A), \p2=(B), \p3=(C),
   \n1={atan2(\x2-\x1,\y2-\y1)}, \n2={atan2(\x3-\x1,\y3-\y1)} in
   (\p1)+(\n1/2+\n2/2:\angleRadius) node[above] {$\alpha$};
   end{tikzpicture}
   \end{document}
2. Save file as obtuseAngle1b.tex
3. Then build or typeset the Latex code.

Output

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