Mathematics, 31.01.2021 18:30 lcaulkett27

BB_1 is the angle bisector of triangle ABC, and I is its incenter. The perpendicular bisector of segment AC intersects the circumcircle of triangle AIC at D and E. Point F is on the segment B_1C such that AB_1=CF. Prove that the four points B, D, E and F are concyclic.

BB_1 is the angle bisector of triangle ABC, and I is its incenter. The perpendicular bisector of s

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BB_1 is the angle bisector of triangle ABC, and I is its incenter. The perpendicular bisector of seg...

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