Perimeter

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% !TEX TS-program = lualatex
% Created by Alain Matthes on 2023-11-10
% Copyright (c) 2023 AlterMundus.
\documentclass{article}
\usepackage{tkz-euclide}
\usepackage{tkz-elements}
\begin{document}
\begin{tkzelements}
   z.A            = point : new (0 , 0)
   z.B            = point : new (4 , 3)
   z.C            = point : new (1 , 5)
   L.AB           = line : new (z.A,z.B)
   d              = L.AB : distance (z.C)
   l              = L.AB.length
   z.H            = L.AB : projection (z.C)
\end{tkzelements}
\begin{tikzpicture}
\tkzGetNodes
\tkzDrawLines(A,B C,H)
\tkzDrawPoints(A,B,C,H)
\tkzLabelPoints(A,B,C,H)
\tkzLabelSegment[above right=2em,draw](C,H){$CH = \tkzUseLua{d}$}
\tkzLabelSegment[below right=1em,draw](A,B){$AB = \tkzUseLua{l}$}
\end{tikzpicture}
\end{document}