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hson011011
2 năm trước
Cho tam giác ABC vuông tại A, đường cao AH. Vẽ đường tròn tâm I có đường kính BHcắt AB ở M. Vẽ đường tròn tâm K có đường kính CH cắt AC ở N. a, Tứ giác `AMHN` là hình gì ? Vì sao ? b, CMR: MN là tiếp tuyến chung của hai đường tròn (I) và (K). c, Vẽ tiếp tuyến Ax của đường tròn ngoại tiếp tam giác ABC. CMR: $Ax//MN$
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