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anhduonggo
2 năm trước
cho tam giác ABC cân tại A . các đường cao AG,BE,CF gặp nhau tại H a chứng minh tứ giác AEHF nội tiếp . xắc định tâm I của đường tròn ngoại tiếp tứ giác đó b chứng minh rằng hai cung HF và HE của đường tròn ngoại tiếp tứ giác AEHF bằng nhau c chứng minh GE là tiếp tuyến của đường tròn tâm I d chứng minh AH × BE = AF × BC
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