Grafik Spatprodukt begonnen

tikzgrafiken/tikz_3_2.tex

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+%!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}