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Mathematics, 20.09.2021 03:40 hanhann6895

Cho tam giác nhọn ABC, D là chân đường cao kẻ từ A và H là trực tâm. Gọi I, J thứ tự là trung điểm BH và CH, đường thẳng DI và DJ cắt cạnh AB và AC tại P và Q. Đường thẳng PQ cắt BH và CH tại M và N. Chứng minh H, M,N, D nằm trên một đường tròn

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Cho tam giác nhọn ABC, D là chân đường cao kẻ từ A và H là trực tâm. Gọi I, J thứ tự là trung điểm B...
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