[tex]d_{AB} = \sqrt{(4-1)^2+(5-1)^2}= \\
= \sqrt{3^2+4^2}= \sqrt{9+16}= \sqrt{25}= \boxed{5} \\ \\
d_{CD}= \sqrt{(7-2)^2+(-9-3)^2}= \\
= \sqrt{5^2+(-12)^2}= \sqrt{25+144}= \sqrt{169}= \boxed{13} \\ \\
d_{MN} = \sqrt{(4-(-2))^2+(8-0)^2}= \\
= \sqrt{6^2+8^2}= \sqrt{36+64}= \sqrt{100}= \boxed{10} [/tex]