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Dear Student∠D = 150°Let∠A =∠B =∠C = xBy angle sum property of quadrilateral,∠A + ∠B + ∠C +∠D = 360°x + x +x+∠D = 360°3x+∠D = 360°3x = 360°–∠D30 = 360° – 150°3x = 210°x = 70°Hence,∠A =∠B =∠C = 70°.Thanks
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