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phamthuylinh10a1
2 năm trước
Bài 5. (5,5 điễm) Trên nửa đường tròn đường kinh AB lầy các điểm C,D (D khác B) sao cho EAD = 30 và đoạn thắng AD cắt đoạn thăng BC tại I. Hạ IH vuông góc với AB (H thuộc AB). a. Gọi E là giao điểm của AC và BD, M là trung điểm của IE. Chứng minh rằng MD là tiếp tuyên của đườmg tròn (O) đường kính AB. CD b. Tính tí số AB c. Chứng minh I là tâm đường tròn nội tiếp tam giác CDH. Giúp e bài này vs ạ🥺🥺🥺
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