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Loga1804
2 năm trước
Cho tam giác ABC nội tiếp (O) đường kính AB (AC < BC). Trên dây CB lấy điểm H (H khác C, B). AH cắt (O) tại điểm thứ hai là D. Kẻ HQ vuông góc với AB (Q thuộc AB). 1. Chứng minh: tứ giác ACHQ nội tiếp. 2. CQ cắt (O) tại điểm thứ hai F. Chứng minh: DF // HQ. 3. Chứng minh H cách đều CD, CQ, DQ.
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