\input{preamble-standalone.ltx} \begin{document} % Ex. No. 176 (Section 21.1.3 : Multiples angles) \begin{tikzpicture}[scale=0.75] \tkzDefPoint(0,0){B} \tkzDefPoint(8,0){C} \tkzDefPoint(0,8){A} \tkzDefPoint(8,8){D} \tkzDrawPolygon(B,C,D,A) \tkzDefTriangle[equilateral](B,C) \tkzGetPoint{M} \tkzInterLL(D,M)(A,B) \tkzGetPoint{N} \tkzDefPointBy[rotation=center N angle -60](D) \tkzGetPoint{L} \tkzInterLL(N,L)(M,B) \tkzGetPoint{P} \tkzInterLL(M,C)(D,L) \tkzGetPoint{Q} \tkzDrawSegments(D,N N,L L,D B,M M,C) \tkzDrawPoints(L,N,P,Q,M,A,D) \tkzLabelPoints[left](N,P,Q) \tkzLabelPoints[above](M,A,D) \tkzLabelPoints(L,B,C) \tkzMarkAngles(C,B,M B,M,C M,C,B% D,L,N L,N,D N,D,L) \tkzFillAngles[fill=red!20,opacity=.2](C,B,M% B,M,C M,C,B D,L,N L,N,D N,D,L) \end{tikzpicture} \end{document}