Chandler Robbins
08/18/2023 · Primary School

Câu 4. \( (3,5 \) điểm). Cho tam giác \( A B C \) cỏ \( A B<A C \), kẻ \( A H \perp B C(H \in B C) \), trên tia đối của tia HA lấy điểm \( K \) sao cho \( H K=H A, G o ̣ i E \) là trung điếm của cạnh \( B C \). a) Chứng minh: \( \widehat{A E H}=\widehat{K E H} \). b) Trên tia đối của tia EAlấy điểm \( D \) sao cho \( E D=E A \). Chứng minh: \( \triangle A C E=\triangle D B E \). c) Chứng minh: \( A C=B D=C K \). d) Chứng minh: \( D K / / B C \).

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a) \( \widehat{AEH} = \widehat{KEH} \) b) \( \triangle ACE = \triangle DBE \) c) \( AC = BD = CK \) d) \( DK \parallel BC \)

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