Bai 3

\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1cm,y=1cm]
\clip(-12.5,-1) rectangle (6,7.5);
\draw [line width=1pt] (-8.35,3.51) circle (3.72cm);
\draw [line width=1pt] (-10.29,6.69)-- (-4.88,4.87);
\draw [line width=1pt] (-5.10,1.67)-- (-4.88,4.87);
\draw [line width=1pt] (-10.29,6.69)-- (-11.61,1.71);
\draw [line width=1pt] (-11.61,1.71)-- (-5.10,1.67);
\draw [line width=1pt] (-10.29,6.69)-- (-6.79,0.12);
\draw [line width=1pt] (-4.88,4.87)-- (-6.79,0.12);

\draw  (-10.29,6.69) circle (1pt);
\draw (-10.45,7.12) node {$A$};
\draw(-4.88,4.87) circle (1pt);
\draw (-4.63,5.22) node {$B$};
\draw (-5.1,1.68) circle (1pt);
\draw (-4.83,1.42) node {$C$};
\draw  (-11.61,1.71) circle (1pt);
\draw(-11.93,1.62) node {$D$};
\draw  (-6.79,0.12) circle (1pt);
\draw (-6.49,-0.02) node {$M$};

\end{tikzpicture}