\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 185 (Section 22.2 : Example of the use of \tkzcname{tkzGetAngle})

\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,brown](B,C)
   \tkzDrawPoints(A,B,C,D)
  \tkzLabelPoints(B,C,D)
  \tkzLabelPoints[above left](A)
  \tkzDrawSegments[style=dashed,color=orange!30](A,C A,D)
\end{tikzpicture}

\end{document}