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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 43 (Section 9.4.1 : Example of symmetry)
\begin{tikzpicture}[scale=1.5]
\tkzDefPoint(0,0){O}
\tkzDefPoint(2,-1){A}
\tkzDefPoint(2,2){B}
\tkzDefPointsBy[symmetry=center O](B,A){}
\tkzDrawLine(A,A')
\tkzDrawLine(B,B')
\tkzMarkAngle[mark=s,arc=lll,
size=2 cm,mkcolor=red](A,O,B)
\tkzLabelAngle[pos=1,circle,draw,
fill=blue!10](A,O,B){$60^{\circ}$}
\tkzDrawPoints(A,B,O,A',B')
\tkzLabelPoints(A,B,O,A',B')
\end{tikzpicture}
\end{document}
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