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| \begin{tikzpicture}%[scale=2]
\draw [node font=\tiny](-3,0) arc(180:0:3)
node foreach \p:\ptext in {0/0,0.0556/10,0.1111/20,0.1667/30,0.2222/40,0.2778/50,0.3333/60,
0.3889/70,0.4444/80,0.5/90,0.5556/100,0.6111/110,0.6667/120,
0.7222/130,0.7778/140,0.8333/150,0.8889/160,0.9444/170,1/180} [below=0.2,sloped,pos=\p]{\ptext};
\draw [node font=\tiny](-2.5,0) arc(180:0:2.5)
node foreach \p:\ptext in {0/180,0.0556/170,0.1111/160,0.1667/150,0.2222/140,0.2778/130,
0.3333/120,0.3889/110,0.4444/100,0.5/90,0.5556/80,0.6111/70,
0.6667/60,0.7222/50,0.7778/40,0.8333/30,0.8889/20,0.9444/10,1/0} [below=0.1,sloped,pos=\p]{\ptext};
\foreach \a in {0,1,...,180}
{\draw (\a:3)--(\a:2.85);}
\foreach \a in {0,5,...,180}
{\draw (\a:3)--(\a:2.8);}
\foreach \a in {0,10,...,180}
{\draw (\a:3)--(\a:2.75) ;}
\foreach \a in {0,10,...,180}
{\draw (\a:2.5)--(\a:2.4);}
\draw (-3,0) arc(180:0:3)--(3,-0.5)--(-3,-0.5)--cycle;
\draw (-2,0)--(2,0);
\draw (0,-0.2)--(0,2);
\end{tikzpicture} |
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