Cho ΔABC biết B(1;1),C(3;2) và trực tâm H(2;2). Lập phương trình đường tròn ngoại tiếp ΔABC
Hướng dẫn:Thực hiện theo các bước:
Bước 1: Lập phương trình đường tròn (C) ngoại tiếp HBC
Bước 2: Nhận xét rằng đường tròn ngoại tiếp ABC và đường tròn (C) đối xứng nhau qua đường thẳng BC.Do đó lấy đối xứng (C) qua BC ta được đường tròn ngoại tiếp ABC
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