DAU COROANA! AVETI IN POZA TOT.

DE||BC => tr. ADE ~ tr. ABC
[tex] \frac{AD}{AB} = \frac{DE}{BC} [/tex]
[tex] \frac{7}{14} = \frac{6}{BC} [/tex]
7BC=14×6
7BC=84 /÷7
BC=12
[tex] \frac{DE}{BC} = \frac{6}{12} = \frac{1}{2} [/tex]