Найдите углы ∠A и ∠D параллелограмма ABCD, если ∠C:∠D=2:7. ∠A=140∘∠D=40∘

∠A=20∘∠D=70∘

∠A=70∘∠D=140∘

∠A=40∘∠D=140∘


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