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thuydxa143
2 năm trước
Cho nữa đường tròn tâm O, đường kính BC = 2R và một điểm A trên nữa đường tròn ấy sao cho BA= R.M là 1 điểm trên cung AC. MB cắt AC tại I. Tia BA cắt tia CM tại D. a) chứng minh ∆ AOB là tam giác đều. b) chứng minh tứ giác AIMD nội tiếp đường tròn. c) tính góc ADI
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