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\begin{tikzpicture}
\tkzDefPoint(0,0){O}
\tkzDefPoint(2,-1){A}
\tkzDefPointBy[rotation= center O angle 90](A)
\tkzGetPoint{B}
\tkzDrawArc[color=blue,<->](O,A)(B)
\tkzDrawArc(O,B)(A)
\tkzDrawLines[add = 0 and .5](O,A O,B)
\tkzDrawPoints(O,A,B)
\tkzLabelPoints[below](O,A,B)
\end{tikzpicture}
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