diff --git a/documents/GeoTopo/Arbeitszeit.md b/documents/GeoTopo/Arbeitszeit.md
index edd9118..3daadd7 100644
--- a/documents/GeoTopo/Arbeitszeit.md
+++ b/documents/GeoTopo/Arbeitszeit.md
@@ -30,3 +30,4 @@ in dem Erstellen dieses Skripts steckt:
 |13.01.2014 | 19:00 - 00:00 | TODOs erledigen; Tippfehler korrigieren
 |14.01.2014 | 11:15 - 12:45 | Digitalisieren der Vorlesung von 14.01.2014
 |14.01.2014 | 12:45 - 12:40 | TikZ'en der Bilder aus Vorlesung von 14.01.2014
+|14.01.2014 | 13:00 -       | TikZ'en der Bilder aus Vorlesung von 14.01.2014
diff --git a/documents/GeoTopo/GeoTopo.pdf b/documents/GeoTopo/GeoTopo.pdf
index 03a2125..e7f5daa 100644
Binary files a/documents/GeoTopo/GeoTopo.pdf and b/documents/GeoTopo/GeoTopo.pdf differ
diff --git a/documents/GeoTopo/GeoTopo.tex b/documents/GeoTopo/GeoTopo.tex
index 9c25c34..974cdf8 100644
--- a/documents/GeoTopo/GeoTopo.tex
+++ b/documents/GeoTopo/GeoTopo.tex
@@ -29,6 +29,7 @@
 \usepackage{tikz}           % draw
 \usepackage{tikz-3dplot}    % draw
 \usepackage{tkz-fct}        % draw
+\usepackage{tkz-euclide}    % draw
 \usetikzlibrary{3d,calc,intersections,er,arrows,positioning,shapes.misc,patterns,fadings,decorations.pathreplacing}
 \usepackage{tqft}
 \usepackage{xspace}   % for new commands; decides weather I want to insert a space after the command
diff --git a/documents/GeoTopo/Kapitel4.tex b/documents/GeoTopo/Kapitel4.tex
index ada1b5f..6be4071 100644
--- a/documents/GeoTopo/Kapitel4.tex
+++ b/documents/GeoTopo/Kapitel4.tex
@@ -263,8 +263,8 @@ aufgestellt.
 
             \begin{figure}
                 \centering
-                \includegraphics[width=0.5\linewidth, keepaspectratio]{figures/todo/bild-3.jpg}
-                \caption{TODO}.
+                \input{figures/geometry-3.tex}
+                \caption{TODO}
                 \label{fig:bild-3}
             \end{figure}
 
diff --git a/documents/GeoTopo/figures/geometry-1.tex b/documents/GeoTopo/figures/geometry-1.tex
index 32a38cf..005762a 100644
--- a/documents/GeoTopo/figures/geometry-1.tex
+++ b/documents/GeoTopo/figures/geometry-1.tex
@@ -17,4 +17,8 @@
     \draw[very thick] (C) edge node  {} (A);
 
     \draw[very thick] (Q) edge node  {} (R);
+
+    \draw[very thick] ($(P)!-1cm!(Q)$) -- ($(Q)!-1cm!(P)$);
+    \draw[very thick] ($(A)!-0.3cm!(B)$) -- ($(B)!-1cm!(A)$);
+    \draw[very thick] ($(R)!-1cm!(Q)$) -- ($(Q)!-1cm!(R)$);
 \end{tikzpicture}
diff --git a/documents/GeoTopo/figures/geometry-2.tex b/documents/GeoTopo/figures/geometry-2.tex
index 8568591..b37c75c 100644
--- a/documents/GeoTopo/figures/geometry-2.tex
+++ b/documents/GeoTopo/figures/geometry-2.tex
@@ -8,6 +8,8 @@
     \draw[very thick] (P) edge node  {} (Q);
     \draw[very thick, red] (P) edge node {} (A);
     \draw[very thick, red] (P) edge node {} (B);
-    \draw[very thick, green] (Q) edge node {} (A);
-    \draw[very thick, green] (Q) edge node {} (B);
+    \draw[very thick, blue] (Q) edge node {} (A);
+    \draw[very thick, blue] (Q) edge node {} (B);
+
+    \draw[very thick] ($(P)!-1cm!(Q)$) -- ($(Q)!-1cm!(P)$);
 \end{tikzpicture}
diff --git a/documents/GeoTopo/figures/geometry-3.tex b/documents/GeoTopo/figures/geometry-3.tex
new file mode 100644
index 0000000..8c8e9ec
--- /dev/null
+++ b/documents/GeoTopo/figures/geometry-3.tex
@@ -0,0 +1,17 @@
+\begin{tikzpicture}
+    \tkzSetUpPoint[shape=circle,size=10,color=black,fill=black]
+    \tkzSetUpLine[line width=1]
+    \tkzDefPoints{0/0/P, 4/0/Q, 1/0.5/B, 1/2/H}
+    \tkzInterLL(P,B)(Q,H) \tkzGetPoint{C}
+
+    \tkzDrawLine(P,H)
+    \tkzDrawLine(Q,H)
+    \tkzDrawLine(P,Q)
+    \tkzDrawLine[add=0 and 0.5](P,C)
+
+    \tkzDrawPoints(P,Q,B,C)
+    \tkzLabelPoint[below](P){$P$}
+    \tkzLabelPoint[below](Q){$Q$}
+    \tkzLabelPoint[below](B){$B$}
+    \tkzLabelPoint[below](C){$C$}
+\end{tikzpicture}
diff --git a/tikz/Readme.md b/tikz/Readme.md
new file mode 100644
index 0000000..8dfab32
--- /dev/null
+++ b/tikz/Readme.md
@@ -0,0 +1 @@
+this includes `tikz` and `tkz-euclide`
diff --git a/tikz/geometry-1/geometry-1.tex b/tikz/geometry-1/geometry-1.tex
index fb99a31..a0f0472 100644
--- a/tikz/geometry-1/geometry-1.tex
+++ b/tikz/geometry-1/geometry-1.tex
@@ -1,5 +1,6 @@
 \documentclass[varwidth=true, border=2pt]{standalone}
 \usepackage{tikz}
+\usetikzlibrary{calc}
 
 \begin{document}
 \begin{tikzpicture}
@@ -21,5 +22,9 @@
     \draw[very thick] (C) edge node  {} (A);
 
     \draw[very thick] (Q) edge node  {} (R);
+
+    \draw[very thick] ($(P)!-1cm!(Q)$) -- ($(Q)!-1cm!(P)$);
+    \draw[very thick] ($(A)!-0.3cm!(B)$) -- ($(B)!-1cm!(A)$);
+    \draw[very thick] ($(R)!-1cm!(Q)$) -- ($(Q)!-1cm!(R)$);
 \end{tikzpicture}
 \end{document}
diff --git a/tikz/geometry-2/geometry-2.png b/tikz/geometry-2/geometry-2.png
index 1e015be..ac65829 100644
Binary files a/tikz/geometry-2/geometry-2.png and b/tikz/geometry-2/geometry-2.png differ
diff --git a/tikz/geometry-2/geometry-2.tex b/tikz/geometry-2/geometry-2.tex
index da283ef..8f7ced3 100644
--- a/tikz/geometry-2/geometry-2.tex
+++ b/tikz/geometry-2/geometry-2.tex
@@ -1,5 +1,6 @@
 \documentclass[varwidth=true, border=2pt]{standalone}
 \usepackage{tikz}
+\usetikzlibrary{calc}
 
 \begin{document}
 \begin{tikzpicture}
@@ -12,7 +13,9 @@
     \draw[very thick] (P) edge node  {} (Q);
     \draw[very thick, red] (P) edge node {} (A);
     \draw[very thick, red] (P) edge node {} (B);
-    \draw[very thick, green] (Q) edge node {} (A);
-    \draw[very thick, green] (Q) edge node {} (B);
+    \draw[very thick, blue] (Q) edge node {} (A);
+    \draw[very thick, blue] (Q) edge node {} (B);
+
+    \draw[very thick] ($(P)!-1cm!(Q)$) -- ($(Q)!-1cm!(P)$);
 \end{tikzpicture}
 \end{document}