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htuan4442
2 năm trước
cho tam giác ABC cân tại A. Kẻ AH ⊥ BC ( H ∈ BC ) a) CM: ΔABH = ΔACH , CM: AH là tia phân giác của ∠BAC b) kẻ HD ⊥ AB ( D ∈ AB ) kẻ HE ⊥ AC ( E ∈ AC ) CM: ΔHDE cân c) nếu cho AB= 4, AH= 3 thì BH bằng bao nhiu d) CM: BC//DE
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