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\section{Protractor}
Based on an idea by Yves Combe, the following macro allows you to draw a protractor.
The operating principle is even simpler. Just name a half-line (a ray). The protractor will be placed on the origin $O$, the direction of the half-line is given by $A$. The angle is measured in the direct direction of the trigonometric circle.
\begin{NewMacroBox}{tkzProtractor}{\oarg{local options}\parg{$O,A$}}%
\begin{tabular}{lll}%
options & default & definition \\
\midrule
\TOline{lw} {0.4 pt} {line thickness}
\TOline{scale} {1} {ratio: adjusts the size of the protractor}
\TOline{return} {false} {trigonometric circle indirect}
\end{tabular}
\end{NewMacroBox}
\subsection{The circular protractor}
Measuring in the forward direction
\begin{tkzexample}[latex=7cm,small]
\begin{tikzpicture}[scale=.5]
\tkzDefPoint(2,0){A}\tkzDefPoint(0,0){O}
\tkzDefShiftPoint[A](31:5){B}
\tkzDefShiftPoint[A](158:5){C}
\tkzDrawPoints(A,B,C)
\tkzDrawSegments[color = red,
line width = 1pt](A,B A,C)
\tkzProtractor[scale = 1](A,B)
\end{tikzpicture}
\end{tkzexample}
\subsection{The circular protractor, transparent and returned}
\begin{tkzexample}[latex=7cm,small]
\begin{tikzpicture}[scale=.5]
\tkzDefPoint(2,3){A}
\tkzDefShiftPoint[A](31:5){B}
\tkzDefShiftPoint[A](158:5){C}
\tkzDrawSegments[color=red,line width=1pt](A,B A,C)
\tkzProtractor[return](A,C)
\end{tikzpicture}
\end{tkzexample}
\endinput
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