added 3 more examples

tikz/line-reflection/line-reflection.tex

@@ -0,0 +1,45 @@
+\documentclass[varwidth=true, border=2pt]{standalone}
+
+\usepackage{tkz-fct}
+\usetikzlibrary{arrows, decorations.pathreplacing}
+
+\begin{document}
+\begin{tikzpicture}
+       \tkzInit [xmin=0,xmax=7.8,ymin=0,ymax=9.5]
+        \begin{scriptsize}
+            \tkzGrid[color = gray!30!white]
+            \tkzAxeXY
+        \end{scriptsize}
+        \draw[thick,green] (0,3.6) -- (8,6.5);
+        \node[green,rotate=20] at (6.5,6.15) {$\scriptstyle g(x) = m \cdot x + t$};
+
+        \draw[dashed,red] (5.5,1) -- (2.5,9);
+
+        \draw[thick,fill=red,red] (5.5,1) circle (2pt);
+        \node[red] at (5.6,1.25) {$P$};
+
+        \draw[thick,fill=red,red] (2.5,9) circle (2pt);
+        \node[red] at (2.8,9) {$P'$};
+
+        \draw[dashed] (2.5,5.05) -- (5.6,5.05);
+
+        \draw [decorate,decoration={brace,amplitude=10pt,mirror,raise=4pt},yshift=0pt]
+        (5.5,1) -- (5.5,5.05)  node [black,midway,xshift=0.8cm] {\footnotesize
+        $\Delta y$};
+
+        \draw [decorate,decoration={brace,amplitude=10pt,mirror,raise=4pt},yshift=0pt]
+        (2.5,9) -- (2.5,5.05)  node [black,midway,xshift=-0.8cm] {\footnotesize
+        $\Delta y$};
+
+        \draw [decorate,decoration={brace,amplitude=2pt,mirror,raise=2pt},yshift=0pt]
+        (2.5,5.05) -- (3.97,5.05)  node [black,midway,yshift=-0.4cm] {\footnotesize
+        $\Delta x$};
+
+        \draw [decorate,decoration={brace,amplitude=2pt,mirror,raise=2pt},yshift=0pt]
+        (3.97,5.05) -- (5.5,5.05)  node [black,midway,yshift=-0.4cm] {\footnotesize
+        $\Delta x$};
+
+        \draw[thick,fill=red,red] (3.97,5.05) circle (2pt);
+        \node[red] at (4.1,5.4) {$L$};
+\end{tikzpicture}
+\end{document}