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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 87 (Section 12.2.4 : Drawing a tangent option \tkzimp{from with R} and \tkzimp{at})
\begin{tikzpicture}[scale=.5]
\tkzDefPoint(0,0){O}
\tkzDefRandPointOn[circle=center O radius 4cm]
\tkzGetPoint{A}
\tkzDefTangent[at=A](O)
\tkzGetPoint{h}
\tkzDrawSegments(O,A)
\tkzDrawCircle(O,A)
\tkzDrawLine[add = 1 and 1](A,h)
\tkzMarkRightAngle[fill=red!30](O,A,h)
\end{tikzpicture}
\end{document}
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