\begin{tikzpicture}[scale=1.5] \tkzDefPoints{ 0/0/A,5/0/B,1/3/C} \tkzDefSpcTriangle[in,name=I](A,B,C){a,b,c} \tkzInCenter(A,B,C)\tkzGetPoint{I} \tkzDrawPolygon[red](A,B,C) \tkzDrawPolygon[blue](Ia,Ib,Ic) \tkzDrawPoints(A,B,C,I,Ia,Ib,Ic) \tkzLabelPoints(A,B,C,I,Ia,Ib,Ic) \tkzDrawCircle[in](A,B,C) \tkzDrawSegments[dashed](A,Ia B,Ib C,Ic) \end{tikzpicture}