Ответ:
а) BC = (0 — (-5); 3 — 6) = (5; -3)
б) AB = (-5 — (-12); 6 — (-4)) = (7; 10)[tex]|AB|=\sqrt{7^{2}+10^{2}}=\sqrt{149}[/tex]
в) [tex]M=(\frac{-12+0}{2};\frac{-4+3}{2})=(-6;-\frac{1}{2})[/tex]
г) AC=(0 — (-12); 3 — (-4)) = (12; 7)
[tex]P_{ABC} =|AB|+|AC|+|BC|=\sqrt{7^{2}+10^{2}}+\sqrt{12^{2}+7^{2}}+\sqrt{5^{2}+(-3)^{2}}=\sqrt{149}+\sqrt{193}+\sqrt{34}[/tex]
д) BM = (-6 — (-5); -[tex]\frac{1}{2}[/tex] — 6) = (-1; -6[tex]\frac{1}{2}[/tex])