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+\input{preamble-standalone.ltx}
+\begin{document}
+
+% Ex. No. 85 (Section 12.2.2 : Example of tangents passing through an external point )
+
+\begin{tikzpicture}[scale=.8]
+ \tkzDefPoint(3,3){c}
+ \tkzDefPoint(6,3){a0}
+ \tkzRadius=1 cm
+ \tkzDrawCircle[R](c,\tkzRadius)
+ \foreach \an in {0,10,...,350}{
+ \tkzDefPointBy[rotation=center c angle \an](a0)
+ \tkzGetPoint{a}
+ \tkzDefTangent[from with R = a](c,\tkzRadius)
+ \tkzGetPoints{e}{f}
+ \tkzDrawLines[color=magenta](a,f a,e)
+ \tkzDrawSegments(c,e c,f)
+ }%
+\end{tikzpicture}
+
+\end{document} \ No newline at end of file