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kaedechan
2 năm trước
Cho ΔABC nhọn, AK là đường cao. Đường tròn tâm O đường kính BC cắt cạnh AC tại D (D khác C), H là giao điểm của đường thẳng BD và đường thẳng AK. Kẻ tiếp tuyến AM của đường tròn (O) với M là tiếp điểm. 1, Chứng minh tgiac DCKH nội tiếp 2, Chứng minh AD.AC=AH.AK=AM² 3, Giả sử tâm của đường tròn ngoại tiếp tam giác ABC thuộc đường thẳng đi qua M và vuông góc với đường thẳng AO. Chứng minh BC= $\sqrt[]{2}$AM *** Mình làm ý 1,2 rồi cần các cao nhân chỉ giáo ý 3*** Sẽ vote, TLHN ạ
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