Z twierdzenia Pitagorasa
[tex] |AD { | }^{2} = |A E{ | }^{2} + |ED { | }^{2} \\\\ |AD { | }^{2} = ( \sqrt{3} {)}^{2} + {5}^{2} \\\\ |AD { | }^{2} = 3 + 25 \\ \\|AD { | }^{2} = 28 \\\\ |AD | = \sqrt{28} \\\\ |AD | = \sqrt{4 \times 7} \\ \\|AD | = 2 \sqrt{7} [/tex]
