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Like many people I want to draw an arc of a circle with given center and given angles. There are many questions about this on this site with accepted answers and I tried to cut and paste the clearest one. That seems to be the collaboration by cmhughes and Tom Bombadil at

Draw arc in tikz when center of circle is specified

However it is not entirely explicit and I am evidently not putting the lines of code where they belong. I tried

\documentclass{amsart}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
   \def\centerarc[#1](#2)(#3:#4:#5)% Syntax: [draw options] (center) (initial angle:final angle:radius)
    { \draw[#1] ($(#2)+({#5*cos(#3)},{#5*sin(#3)})$) arc (#3:#4:#5); }
   \centerarc[red,thick](0,0)(5:85:1)
\end{tikzpicture}
\end{document}

And I get message : "See the tikz package documentation for explanation." I did what I could with the documentation, and of course tried changing the code in many ways but did not hit on the right one.

Where do the lines belong?

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Colin McLarty
  • 2,753
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    You need to add tikz calc library – Salim Bou Mar 16 '17 at 21:07
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    If that is all you see of the error, then you are done a disservice by your editor. Look in the .log file, and you'll see that it says quite explicitly what you need to do: "! Package tikz Error: You need to say \usetikzlibrary{calc} for coordinate calculation. See the tikz package documentation for explanation." – Torbjørn T. Mar 17 '17 at 16:19

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