Cho ba điểm A,B,C thẳng hàng(B nằm giữa A,C). Vẽ đường tròn(O,R) đường kính BC, vẽ tiếp tuyến AM của (O) (M là tiếp điểm) đường thẳng qua M vuông góc với BC tại H cắt (O) tại M'. Đường thẳng qua B và song song với MC cắt MM' và MA lần lượt tại D và E. Chứng minh tam giác MED cân
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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![](https://rs.olm.vn/images/avt/0.png?1311)
Câu c.
Gọi K là trung điểm của BH
Chỉ ra K là trực tâm của tam giác BMI
Chứng minh MK//EI
Chứng minh M là trung điểm của BE (t.c đường trung bình)