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\begin{tikzpicture}[scale=.75]
\tkzDefPoint(1,2){O}
\tkzDefPoint(2,5){I}
\tkzDefPointWith[orthogonal](O,I)
\tkzGetPoint{J}
\tkzDefPointWith[orthogonal,K=-1](O,I)
\tkzGetPoint{K}
\tkzDrawSegment(O,I)
\tkzDrawSegments[->](O,J O,K)
\tkzMarkRightAngles(I,O,J I,O,K)
\tkzDrawPoints(O,I,J,K)
\tkzLabelPoints(O,I,J,K)
\end{tikzpicture}
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