Say I draw a an isosceles triangle (like below)... How could I mark the two sides to be equal using the usual notation?
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\documentclass[12pt, a4paper, fleqn, leqno]{article}
\pagestyle{empty}
\linespread{1.5}
\usepackage{polynom}
\usepackage{amsmath}
\usepackage{pstricks}
\usepackage{pst-plot}
\usepackage[lmargin=1cm, rmargin=1cm, tmargin=1cm, bmargin=1cm]{geometry}
\usepackage{pst-eucl}
\newcommand{\cosec}{\operatorname{cosec}}
\begin{document}
\begin{pspicture}(-5,0)(5,5)
\psline(-5,0)(0,5)
\psline(5,0)(0,5)
\psline(-5,0)(5,0)
\end{pspicture}
\end{document} 