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cuctinhy0811
2 năm trước
cho tam giác cân ABC có AB=AC=5cm , BC=8cm. Kẻ AH vuông góc với BC ( H∈BC ) a) cm: AH là phân giác của góc BAC và tính độ dài AH b) Kẻ HD⊥AB (D∈AB) , kẻ HE ⊥AC (E ⊥AC). cm: ΔHDE là Δ cân c) cm: DE ║BC d) trên tia HE lấy Q sao cho EH=EQ, trên tia HD lấy K sao cho HD=KD. cm:góc AKQ= góc AQK e) giả sử ΔABC vuông cân tại A. cm Q,A,K thẳng hàng.
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