\[A(5;\ - 1);B( - 3;\ 5);\ C( - 3;\ - 1).\]
\[1)\ \]
\[2)\ AB = \sqrt{(5 + 3)^{2} + ( - 1 - 5)^{2}} =\]
\[= \sqrt{64 + 36} = 10.\]
\[BC = \sqrt{( - 3 + 3)^{2} + (5 + 1)^{2}} =\]
\[= \sqrt{0 + 36} = 6.\]
\[AC = \sqrt{(5 + 3)^{2} + ( - 1 + 1)^{2}} =\]
\[= \sqrt{64 + 0} = 8.\]
\[Ответ:\ \ 6;\ 8;\ 10.\]