From 65a94f794f031743255e22b8fc612822e57e73ec Mon Sep 17 00:00:00 2001
From: Sven Riwoldt <sven.riwoldt@web.de>
Date: Mon, 26 Oct 2020 20:31:37 +0100
Subject: [PATCH] Grafik Spatprodukt begonnen

---
 tikzgrafiken/Grafiken.tex  |  7 +++----
 tikzgrafiken/tikz_3_2.tex  | 29 +++++++++++++++++++++++++++++
 tikzgrafiken/tikz_3_2.tikz | 14 --------------
 tikzgrafiken/tikz_3_3.tex  | 19 +++++++++++++++++++
 4 files changed, 51 insertions(+), 18 deletions(-)
 create mode 100644 tikzgrafiken/tikz_3_2.tex
 delete mode 100644 tikzgrafiken/tikz_3_2.tikz
 create mode 100644 tikzgrafiken/tikz_3_3.tex

diff --git a/tikzgrafiken/Grafiken.tex b/tikzgrafiken/Grafiken.tex
index fde3acf..072037a 100644
--- a/tikzgrafiken/Grafiken.tex
+++ b/tikzgrafiken/Grafiken.tex
@@ -15,12 +15,11 @@
 
 \begin{document}
 
-%\includegraphics[scale=0.75]{HTW3.png}
 
-%\input{HTW1_1_3.tikz}
+\input{tikz_3_2.tex}
 
+\newpage
 
-\input{tikz_3_2.tikz}
-
+\input{tikz_3_3.tex}
 
 \end{document}
diff --git a/tikzgrafiken/tikz_3_2.tex b/tikzgrafiken/tikz_3_2.tex
new file mode 100644
index 0000000..606fc1f
--- /dev/null
+++ b/tikzgrafiken/tikz_3_2.tex
@@ -0,0 +1,29 @@
+%!TEX root=Grafiken.tex
+
+\usetikzlibrary{arrows}
+\usetikzlibrary{snakes}
+
+\begin{tikzpicture}[scale=1.5]
+
+% https://tex.stackexchange.com/questions/175016/how-is-arc-defined-in-tikz
+
+%\draw (x,y) arc (start:stop:radius); draws an arc
+
+%with radius radius
+%starts from (x,y)
+%with center (x-r*cos(start), y-r*sin(start)) and
+%ends at (x-r*cos(start)+r*cos(stop), y-r*sin(start)+r*sin(stop)).
+
+
+
+
+
+    \draw[help lines] (-5,-5) grid (5,5);
+  
+	\draw[red] (1,0) arc (0:56:1) node[midway,xshift=-15, yshift=-6]{$\alpha$};
+	
+        \draw [thick,-latex] (0,0) -- (3,0);
+        \draw [thick,dashed] (1,1.5) -- (4,1.5);
+        \draw [thick, -latex] (0,0) -- (1,1.5);
+	    \draw [thick,dashed] (3,0) -- (4,1.5);
+\end{tikzpicture}
diff --git a/tikzgrafiken/tikz_3_2.tikz b/tikzgrafiken/tikz_3_2.tikz
deleted file mode 100644
index 53da49e..0000000
--- a/tikzgrafiken/tikz_3_2.tikz
+++ /dev/null
@@ -1,14 +0,0 @@
-
-\usetikzlibrary{arrows}
-\usetikzlibrary{snakes}
-
-\begin{tikzpicture}[scale=1.5]
-
-
-    \draw[help lines] (-5,-5) grid (5,5);
-  
-        \draw [thick,-latex] (0,0) -- (3,0);
-        \draw [thick,dashed] (1,1.5) -- (4,1.5);
-        \draw [thick, -latex] (0,0) -- (1,1.5);
-	    \draw [thick,dashed] (3,0) -- (4,1.5);
-\end{tikzpicture}
diff --git a/tikzgrafiken/tikz_3_3.tex b/tikzgrafiken/tikz_3_3.tex
new file mode 100644
index 0000000..0030ac7
--- /dev/null
+++ b/tikzgrafiken/tikz_3_3.tex
@@ -0,0 +1,19 @@
+%!TEX root=Grafiken.tex
+
+\usetikzlibrary{arrows}
+\usetikzlibrary{snakes}
+
+\begin{tikzpicture}[scale=1.5]
+
+    \draw[help lines] (-5,-5) grid (5,5);
+
+	
+    \draw [thick,-latex] (0,0) -- (3,0);
+	 \draw [thick,-latex] (0,0) -- (1,2);
+	 \draw [thick,-latex, dashed] (0,0) -- (1.2,0.5);
+	 \draw [thick, dashed] (1.2,0.5) -- (4.2,0.5);
+
+ %       \draw [thick,dashed] (1,1.5) -- (4,1.5);
+ %       \draw [thick, -latex] (0,0) -- (1,1.5);
+%	    \draw [thick,dashed] (3,0) -- (4,1.5);
+\end{tikzpicture}