Triangles The Invaders!

Geometry Level 2

Help! "Semicircle" country is invaded by so many right-angled triangles! The army of the "Semicircle" country need your help. They said: "∠AJH=156° and AJ=JH. ∠BAG and ∠BHG are separated into 5 equal parts. Their weakest part is at ∠DAH. If we able to determine the angle, we could destroy them immediately!" So, help them to determine ∠DAH.

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