\documentclass[11pt,a4paper,french]{article}
\usepackage{tikz}
\usepackage{tkz-euclide}
\usepackage{animate}
\begin{document}
\begin{animateinline}[controls]{100}
\multiframe{200}{rdep=0+0.02}{%
\begin{tikzpicture}
\draw[help lines] (0,0) grid (5,5);
\tkzDefPoints{\rdep/0/B,1+\rdep/0/C,1+\rdep/5/D}
\tkzFillAngle[green,size=1](B,D,C)
\tkzDrawSegments[thick](B,D D,C)
\tkzDefPoints{0/0/B1,1+0/0/C1,2+0/5/E}
\tkzFillAngle[blue,size=1](B1,E,C1)
\tkzDrawSegments[thick](B1,E E,C1)
\end{tikzpicture}
}
\multiframe{200}{rdepp=0+0.015}{%
\begin{tikzpicture}
\draw[help lines] (0,0) grid (5,5);
\tkzDefPoints{4/0/B,1+4/0/C,1+4/5/D}
\tkzFillAngle[green,size=1](B,D,C)
\tkzDrawSegments[thick](B,D D,C)
\tkzDefPoints{\rdepp/0/B1,1+\rdepp/0/C1,2+\rdepp/5/E}
\tkzFillAngle[blue,size=1](B1,E,C1)
\tkzDrawSegments[thick](B1,E E,C1)
\end{tikzpicture}
}
\end{animateinline}
\end{document}