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is 130° Step-by-step explanation:AO || CD AND OB|| CEthereforThe ANGLES are CONGRUENT to each other/_ AOB= 50° therefor /_ CDB = also 50°and ANGLE CDB or angle ECD is corresponding angles and the sum of two corresponding angles is 180°therefor180 = CDB + ECD 180= 50 + ECDECD = 180-50ECD = 130°Ok Brother !!check this answer is right



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