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+\input{preamble-standalone.ltx}
+\begin{document}
+
+% Ex. No. 201 (Section 29.2.2 : Circle and tangent)
+
+\begin{tikzpicture}
+ \edef\alphaR{\fpeval{asin(2/3)}}
+ \edef\xB{8-3*cos(\alphaR)}
+ \tkzDrawX[noticks,label=$(d)$]
+ \tkzDefPoint["$A$" above right](8,2){A}
+ \tkzDefPoint[color=red,"$O$" above right](0,0){O}
+ \tkzDefPoint["$B$" above left](\xB,4){B}
+ \tkzDefLine[orthogonal=through B](A,B) \tkzGetPoint{b}
+ \tkzDefPoint(1,0){i}
+ \tkzInterLL(B,b)(O,i) \tkzGetPoint{B'}
+ \tkzDrawSegment[line width=1pt](A,B)
+ \tkzHLine[color=red,style=dashed]{4}
+ \tkzText[above](12,4){$\delta$}
+ \tkzDrawCircle[R,color=blue,line width=.8pt](A,3 cm)
+ \tkzDrawPoint(B')
+ \tkzDrawLine(B,B')
+\end{tikzpicture}
+
+\end{document}