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Geometry ProblemClick the figure below to see the complete problem 507 about Triangle, Interior Point, 120 Degrees, Congruence, Angle.
The problem has been corrected.
Draw CG = AC, G on extension of AD=> ▲DGC isoceles, => ▲BGD equilateral=> B, D, C are on circle with center G=> x = 1/2 arc BD, BGD = arc BD, => x = 1/2 BGD=> x = 30°
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