Consider D ∈ (BC) the bisector leg of the angle A of the triangle ABC. a) If AB = AC = 3 and measure of angle (BAC) = 120 degrees, calculate AD. b) If AB + CD = AC + BD, show that the triangle ABC is isosceles OBSERVATION : SOLVE ONLY POINT b) because 1) is already solved, hope the same tutor who solved a foe me and asked me to put the question separatley if he can solve the rest i mean the b part, thanks in advance.

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