\input{preamble-standalone.ltx} \begin{document} % Ex. No. 107 (Section 14.5.3 : Labels for an isosceles triangle) \begin{tikzpicture}[scale=1] \tkzDefPoints{0/0/O,2/2/A,4/0/B,6/2/C} \tkzDrawSegments(O,A A,B) \tkzDrawPoints(O,A,B) \tkzDrawLine(O,B) \tkzLabelSegments[color=red,above=4pt](O,A A,B){$a$} \end{tikzpicture} \end{document}