∠А = 180-128-52°
∠D=180-154=26°
∠B=180-∠A= 128°
∠C= 180-∠D=154°
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∠А = 180-128-52°
∠D=180-154=26°
∠B=180-∠A= 128°
∠C= 180-∠D=154°