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যদি $AB=AC$, $\angle ABE=20°$, $\angle EBC=60°$, $\angle ACF=30°$, $\angle FCB=50°$ হয়, তাহলে $\angle FEB = ?$


Source: GEOMETRY REVISITED


Geometry  


Angle Chasing  


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Attempt 1219


Solve 909


First Solve Gourab