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I was trying to draw arcs in tikz, and I was using code from this site

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
\begin{document}
\begin{tikzpicture}
\draw (0,0) arc (0:270:8mm);
\draw (0,0) arc (0:315:1.75cm and 1cm);
\filldraw[fill=cyan, draw=blue] (0,0) -- (12mm,0mm) arc (0:30:12mm) -- (0,0);
\end{tikzpicture}
\end{document}

But this does not work

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
\begin{document}
\begin{tikzpicture}
\draw (0,0)  arc[radius = 8mm, start angle= 0, end angle= 270]
\draw (0,0)  arc[x radius = 1.75cm, y radius = 1cm, start angle= 0, end angle= 315]
\end{tikzpicture}
\end{document}

He just keeps compiling, absorbing 100% CPU according to my Activity Monitor. Is this normal? Is it possible something hasn't been installed properly?

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2  
Your second example should gives errors: you are missing ; at the end of the two \draw lines. If I add them in all is well: what version of pgf do you have installed? – Joseph Wright♦ Feb 13 at 9:40
Thanks, I used ; but it still doesn't work. I checked the log-file, it says: Package: pgf 2008/01/15 v2.00 (rcs-revision 1.12) – fred Feb 13 at 10:56
2  
It may well be that the key-value syntax for arcs came after that version of PGF. Take a look at your version of the manual (texdoc pgf) to see if that is a valid syntax for specifying arcs. If not, you either have to update TikZ/PGF (recommended) or use the old syntax. – Andrew Stacey Feb 13 at 11:24
Thanks, that changes my problem into the one discussed <a href="tex.stackexchange.com/questions/11148/… site</a> installing tikz (or updating it) According to my Tex Live Utility there is nothing new to be installed, and simply downloading a new version and dropping the new pgf folder in Users/myname/Library/texmf/tex/generic doesn't do the job either. – fred Feb 13 at 12:25

closed as too localized by percusse, lockstep, Thorsten, Stefan Kottwitz♦ Mar 30 at 12:39

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