How Can I Prove AH = DK in Triangle Congruency?

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This is where I got so far. I can't figure out how to prove AH = DK in order to prove the HL property of congruency
 

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I'm assuming you need to prove $\overline{AH}=\overline{DK}$.

After proving $\triangle{ADK}\cong\triangle{ABH}$ what can you say about the sides of these two triangles?