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thanhthuyet02
2 năm trước
Bài 5: Cho đường tròn (O;3cm) và điểm A thỏa mãn OA = 5cm. Kẻ các tiếp tuyến AB, AC với đường tròn. Gọi H là giao điểm của AO với BC. a) Tính OH. b) Qua điểm M bất kỳ thuộc cung nhỏ BC kẻ tiếp tuyến với (O) cắt AB, AC theo thứ tự tại D và E. Tính chu vi tam giác ADE. Giúp mình làm bài này với ạ, giải thích kĩ câu b với ạ!Hứa vote 5 sao và câu trả lời hay nhất ạ!Cám ơn ạ!
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