\input{preamble-standalone.ltx} \begin{document} % Ex. No. 106 (Section 14.5.2 : Labels and right-angled triangle) \begin{tikzpicture}[rotate=-60] \tikzset{label seg style/.append style = {% color = red, }} \tkzDefPoint(0,1){A} \tkzDefPoint(2,4){C} \tkzDefPointWith[orthogonal normed,K=7](C,A) \tkzGetPoint{B} \tkzDrawPolygon[green!60!black](A,B,C) \tkzDrawLine[altitude,dashed,color=magenta](B,C,A) \tkzGetPoint{P} \tkzLabelPoint[left](A){$A$} \tkzLabelPoint[right](B){$B$} \tkzLabelPoint[above](C){$C$} \tkzLabelPoint[below](P){$P$} \tkzLabelSegment[](B,A){$c$} \tkzLabelSegment[swap](B,C){$a$} \tkzLabelSegment[swap](C,A){$b$} \tkzMarkAngles[size=1cm, color=cyan,mark=|](C,B,A A,C,P) \tkzMarkAngle[size=0.75cm, color=orange,mark=||](P,C,B) \tkzMarkAngle[size=0.75cm, color=orange,mark=||](B,A,C) \tkzMarkRightAngles[german](A,C,B B,P,C) \end{tikzpicture} \end{document}