\begin{tikzpicture} \tkzDefPoint["$A$" left](1,5){A} \tkzDefPoint["$B$" right](5,2){B} \tkzDefPointBy[rotation in rad= center A angle pi/3](B) \tkzGetPoint{C} \tkzDrawSegment(A,B) \tkzDrawPoints(A,B,C) \tkzCompass[color=red](A,C) \tkzCompass[color=red](B,C) \tkzLabelPoints(C) \end{tikzpicture}