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\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 70 (Section 13.1.3 : An envelope)

\begin{tikzpicture}[scale=1]
  \tkzInit[xmin=-6,ymin=-6,xmax=6,ymax=6]
  \tkzClip
  \tkzDefPoint(0,0){O}
  \tkzDefPoint(132:4){A}
  \tkzDefPoint(5,0){B}
  \foreach \ang in {5,10,...,360}{%
    \tkzDefPoint(\ang:5){M}
    \tkzDefLine[mediator](A,M)
    \tkzDrawLine[color=magenta,add= 4 and 4](tkzFirstPointResult,tkzSecondPointResult)}
\end{tikzpicture}

\end{document}