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logaloga99
2 năm trước
Cho tam giác vuông cân ABC ( AB = AC ) đường cao AH. Trên đoạn thẳng HC lấy điểm K rồi dựng hình chữ nhật AHKO. Lấy O làm tâm, vẽ đường tròn bán kính OK, điểm đường tròn này cắt cạnh AB tại D, cắt cạnh AC tại E. Gọi F là giao điểm thứ 2 của đường tròn (O) với đường thẳng AB. Chứng Minh a, Tam giác AEF là tam giác cân b, DO vuông góc OE c, D,A,O,E nằm trên cùng một đường tròn Giúp mình với mấy bạn đội tuyển toán Cám ơn các bạn ạ =)))
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