AB 7 Exercice 3: 1) Soit CDE un triangle rectangle en E. Sachant que CD=8cm et CE=3cm, calculer l'angle ECD. 2) Soit ABC un triangle rectangle en C. Sachant que ABC=15 et BC=5,5 cm, calculer AC.
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AB^2 = CD^2 + CE^2
AB^2 = 8^2 + 3^2
AB^2 = 73
AB = √73