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[tex]\it Fie\ M(x,\ y)\ mijlocul\ laturii\ AC.\\ \\ \left\begin{aligned}x=\dfrac{x_A+x_C}{2}=\dfrac{1-2}{2}=-\dfrac{1}{2}\\ \\ \\ y=\dfrac{y_A+y_C}{2}=\dfrac{-1+2}{2}=\dfrac{1}{2}\end{aligned}\right\} \Rightarrow M\Big(-\dfrac{1}{2},\ \dfrac{1}{2}\Big)\\ \\ \\ BM:\ \ \dfrac{x-x_B}{x_M-x_B}=\dfrac{y-y_B}{y_M-y_B}[/tex]
