\input{preamble-standalone.ltx} \begin{document} % Ex. No. 202 (Section 29.2.3 : About right triangle) \begin{tikzpicture} \tkzDefPoint["$A$" left](2,1){A} \tkzDefPoint(6,4){B} \tkzDrawSegment(A,B) \tkzDrawPoint[color=red](A) \tkzDrawPoint[color=red](B) \tkzDefPointWith[orthogonal,K=-1](B,A) \tkzDrawLine[add = .5 and .5](B,tkzPointResult) \tkzInterLC[R](B,tkzPointResult)(A,8 cm) \tkzGetPoints{C}{J} \tkzDrawPoint[color=red](C) \tkzCompass(A,C) \tkzMarkRightAngle(A,B,C) \tkzDrawLine[color=gray,style=dashed](A,C) \end{tikzpicture} \end{document}