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4 83 1238 ©Y |ABC-69°,|ACB=31° T3[BDC somsttono. 3 1238

Answer»

In ∆ ABC ∠A + ∠ABC + ∠ACB = 180°∠A = 180° - 100° = 80°So, ∆ ABC and ∆ BDC have same base so ∠ A = ∠ D So ,∠D = 80°



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