Mathematics, 14.06.2021 14:00 kelseatuttleni

Cho đường tròn tâm O đường kính AB. Trên đường tròn lấy D khác A, B sao cho góc DAB lớn hơn 60 độ. Trên đường kính AB lấy C khác A, B và kẻ CH vuông góc với AD tại H. Phân giác trong của góc DAB cắt (O) tại E (E KHÁC A) và cắt CH tại F. Đường thẳng OF cắt (O) tại N. Khi AD=BC, chứng minh rằng DN đi qua trung điểm AC

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Cho đường tròn tâm O đường kính AB. Trên đường tròn lấy D khác A, B sao cho góc DAB lớn hơn 60 độ. T...

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