[tex] AM - mediana~\Rightarrow [BM] \equiv [MC] \\ \\
\Delta ABM~~|~~AM -comuna~~|~C.C \\
\Delta AMC~~|~~[BM] \equiv [MC]~~~| \Rightarrow \Delta ABM \equiv \Delta ACM \Rightarrow [AB] \equiv [AC] \\ \\ \\
\text{In} \Delta ABC \\
~[AB] \equiv [AC] \Rightarrow \Delta ABC \text{ isoscel} [/tex]
