\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}
