\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}