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Geometry Problem 1370: Equilic Quadrilateral, 120 Degrees, Congruence, Midpoint, Diagonal, Equilateral Triangle

Proposition

In the figure below ABCD is an equilic quadrilateral. If equilateral triangle BJC is drawn externally on the side BC, prove that AJD is also an equilateral triangle.



Geometry Problem 1370 Equilic quadrilateral

 

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