[Hình 7] Chứng minh trung điểm

N

nhuquynhdat

Kẻ $DN, EM \perp HK ( M, N \in KH)$

CM: $\Delta ADN=\Delta BAH (Ch-Gn) \Longrightarrow DN=AH$

$\Delta AEM=\Delta CAH (Ch-Gn) \Longrightarrow EM=AH \Longrightarrow DN=EM$

Sau đó CM: $\Delta DKN=\Delta EKM(g-c-g) \Longrightarrow DK=EK \Longrightarrow $ đpcm
 
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