\begin{tikzpicture}[scale=.5] \tkzDefPoint(2,0){A}\tkzDefPoint(0,0){O} \tkzDefShiftPoint[A](31:5){B} \tkzDefShiftPoint[A](158:5){C} \tkzDrawPoints(A,B,C) \tkzDrawSegments[color = red, line width = 1pt](A,B A,C) \tkzProtractor[scale = 1](A,B) \end{tikzpicture}