Mathematics
Mathematics, 03.10.2021 14:00, Jstylez1789

Cho tam giác ABC cân tại A, các đường cao AD và BE cắt nhau tại H . Vẽ đường tròn tâm (O) có đường kính AH. Chứng minh: a)Điểm E nằm trên đường tròn (O)
b)DE là tiếp tuyến của đường tròn (O)

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Cho tam giác ABC cân tại A, các đường cao AD và BE cắt nhau tại H . Vẽ đường tròn tâm (O) có đường k...

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