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Raspiši mi duljinu | Length bashing #4

U trokutu \triangle ABC, AB = AC = 10 i BC = 12. Točka D leži strogo između točaka A i B na stranici \overline{AB}, a točka E leži strogo između točaka A i C na stranici \overline{AC} tako da vrijedi AD = DE = EC. Odredi duljinu dužine AD. Odgovor zaokruži na 3 decimale.

In \triangle ABC, AB = AC = 10 and BC = 12. Point D lies strictly between A and B on \overline{AB} and point E lies strictly between A and C on \overline{AC} so that AD = DE = EC. Find AD . Round your answer to three decimal places.