Cho tam giác ABC nhọn có AB nhỏ hơn AC nội tiếp đường tròn tâm O

a) Ta có:
Gọi I là giao điểm của AD và FC.
Ta có: $\angle{FAC} = \angle{BAC} = \angle{BAD}$ (do AB nằm trên đường tròn (O)).
Vậy tam giác BAD đồng dạng với tam giác FAC.

b) Ta có:
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