Marking angles in tkz-euclide

Question

I am trying to reproduce an example from (an excellent) manual on tkz-euclide. Here is an MWE:

    \documentclass{article}
    \usepackage{tkz-euclide}
    \begin{document}
        \begin{tikzpicture}[scale=.75]
            \tkzDefPoints{0/0/O,5/0/A,3/4/B}
            \tkzMarkAngle[size = 4,mark = x,
            arc=ll,mkcolor = red,mkpos=.33](A,O,B)
            \tkzMarkAngle[size = 2,mark = ||,
            arc=ll,mkcolor = blue,mkpos=.66](A,O,B)
            \tkzDrawLines(O,A O,B)
            \tkzDrawPoints(O,A,B)
        \end{tikzpicture}
    \end{document}

But, no… Here is the output:

Obviously, something is wrong with the size of the marking. However, when I increase the size parameter, say: \tkzMarkAngle[size = 15,mark = x,arc=ll,mkcolor = red,mkpos=.33](A,O,B) then it becomes even worse (note how far away to the right the cross marking is):

Even worse than that: when I remove the cross markings from the arcs (I like to distinguish the angles with the number of arcs since I have a few in my drawing), they don't disappear:

    \tkzMarkAngle[size = 15,arc=ll](A,O,B)  
    \tkzMarkAngle[size = 2, arc=ll](A,O,B)

Result:

Hash-mark is still there — very far to the right…

Update: When I reinstall TexLive (basically LaTeX itself), it updated all the packages tkz-euklid including. Everything is working now without the units. Thanks Alain!

Answer 1

For future generations: The trick is that you have to put the units for the size of the arc.

\documentclass{article}
\usepackage{tkz-euclide}
\begin{document}
    \begin{tikzpicture}[scale=.75]
        \tkzDefPoints{0/0/O,5/0/A,3/4/B}
        \tkzMarkAngle[size = 4cm,mark = x,
        arc=ll,mkcolor = red,mkpos=.33](A,O,B)
        \tkzMarkAngle[size = 2cm,mark = ||,
        arc=ll,mkcolor = blue,mkpos=.66](A,O,B)
        \tkzDrawLines(O,A O,B)
        \tkzDrawPoints(O,A,B)
    \end{tikzpicture}
\end{document}

Answer 2

With version 4.05. Since version 4, it is no longer necessary to add the units (which can cause errors) because the unit is "only cm". Note that at the same time tkz-euclide has become independent of tkz-base. If you use both packages then you have to load tkz-base first. The next version is 4.1 with dot product, power circle, radical axis etc. in several days and the next version 5 will use lua for calculations.

\documentclass{standalone} 
\usepackage{tkz-euclide}

\begin{document} 
  
      \begin{tikzpicture}[scale=.75]
          \tkzDefPoints{0/0/O,5/0/A,3/4/B}
          \tkzMarkAngle[size = 4,mark = x,
          arc=ll,mkcolor = red,mkpos=.33](A,O,B)
          \tkzMarkAngle[size = 2,mark = ||,
          arc=ll,mkcolor = blue,mkpos=.66](A,O,B)
          \tkzDrawLines(O,A O,B)
          \tkzDrawPoints(O,A,B)
      \end{tikzpicture}
  \end{document}