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Phvietthoan
2 năm trước
Cho tam giác ABC có ba góc nhọn nội tiếp đường tròn (O). Các đường cao AA’, BB’ của tam giác ABC cắt nhau tại H và cắt đường tròn lần lượt tại D và E. a) Chúng minh : Các tứ giác A’HB’C và AB’A’B nội tiếp được đường tròn. b) Chúng minh : CD = CE c) Chúng minh : BHD cân d) Chúng minh : CD = CH.
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