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

% Ex. No. 76 (Section 11.5 : Random point on a circle)

\begin{tikzpicture}
  \tkzInit[xmax=5,ymax=5]  \tkzGrid
  \tkzDefPoints{3/2/A,1/1/B}
  \tkzCalcLength[cm](A,B) \tkzGetLength{rAB}
  \tkzDrawCircle[R](A,\rAB cm)
  \tkzDefRandPointOn[circle = center A radius
   \rAB cm]\tkzGetPoint{a}
  \tkzDrawSegment(A,a)
  \tkzDrawPoints(A,B,a)
  \tkzLabelPoints(A,B,a)
\end{tikzpicture}

\end{document}