1) [m]AB = \sqrt{(-3-5)^2 + (1+5)^2} = \sqrt{(-8)^2 + 6^2} = \sqrt{64 + 36} = \sqrt{100} = 10[/m]
2) [m]CD = \sqrt{(-7+10)^2 + (4-8)^2} = \sqrt{3^2 + (-4)^2} = \sqrt{9 + 16} = \sqrt{25} = 5[/m]
3) [m]EF = \sqrt{(2-2)^2 + (2-6)^2} = \sqrt{0^2 + (-4)^2} = \sqrt{0 + 16} = \sqrt{16} = 4[/m]
7) [m]KL = \sqrt{(8-1)^2 + (5-2)^2 + (-4-5)^2} = \sqrt{7^2 + 3^2 + (-9)^2} =[/m]
[m]= \sqrt{49 + 9 + 81} = \sqrt{139}[/m]
8) [m]GH = \sqrt{(2-0)^2 + (6-8)^2 + (-1+1)^2} = \sqrt{2^2 + 2^2 + 0^2} =[/m]
[m]= \sqrt{4 + 4 + 0} = \sqrt{8} = 2\sqrt{2}[/m]
Остальные сами, там с нулями совсем просто.