cho hình thang ABCD có hai đáy là AB,CD ; ∠A=3.∠D; ∠B=∠C cạnh AB = √2cm, AD=3cm CD= 4cm a) c/m ∠A+ ∠D= ∠B+ ∠C b) tính các góc của hình thang c) hạ AH vg góc vs CD tại H. Tính dộ dài cạnh AH và diện tích hình thang ABCD mong các bn giúp mk ạ, hứa sẽ vote 5* ạ

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