\begin{tikzpicture}[scale=.5] \tkzDefPoint(2,3){A} \tkzDefPoint(5,-1){B} \tkzDefPoint[label=below:$\mathcal{C}$, shift={(2,3)}](-30:5.5){E} \begin{scope}[shift=(A)] \tkzDefPoint(30:5){C} \end{scope} \tkzCalcLength[cm](A,B)\tkzGetLength{rAB} \tkzDrawCircle[R](A,\rAB cm) \tkzDrawSegment(A,B) \tkzDrawPoints(A,B,C) \tkzLabelPoints(B,C) \tkzLabelPoints[above](A) \end{tikzpicture}