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\begin{tikzpicture}
\tkzInit
\tkzDefPoint(1,5){A} \tkzDefPoint(5,2){B}
\tkzDrawSegment(A,B)
\tkzFindSlopeAngle(A,B)\tkzGetAngle{tkzang}
\tkzDefPointBy[rotation= center A angle \tkzang ](B)
\tkzGetPoint{C}
\tkzDefPointBy[rotation= center A angle -\tkzang ](B)
\tkzGetPoint{D}
\tkzCompass[length=1,dashed,color=red](A,C)
\tkzCompass[delta=10,Maroon](B,C)
\tkzDrawPoints(A,B,C,D)
\tkzLabelPoints(B,C,D)
\tkzLabelPoints[above left](A)
\tkzDrawSegments[style=dashed,color=bistre](A,C A,D)
\end{tikzpicture}
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