I'm trying to draw an arc between two points, centered at a third. I thought the following example should work


  \tkzDrawLines[add = 0 and .5](O,A O,B)


instead I get an error message that \tkzDrawArc is an undefined control sequence.


You need to add the line


to your preamble straight after \usepackage{tkz-euclide}. From the README in the CTAN entry for tkz-euclide:

To use the package tkz-euclide, place the following lines in the preamble of your LaTeX document.


\usepackage{tkz-euclide} loads tkz-base and TikZ. \usetkzobj{all} loads all objects used by tkz-euclide.

You’ll get a second error from the Maroon colour which isn’t defined yet; add the line

\usepackage[usenames, dvipsnames]{xcolor}

before you load tkz-euclide to get that colour.

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