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Answer 1

Ans.7  Let the measure angle A be x   Angle A + Angle B = 180° [ Sum of the measures of a triangle is 180° ] x + x + 20 = 180° 2x + 20 = 180° 2x = 180 - 20 2x = 160 [ Divide 160 by 2 ] X = 80°  Angle A = 80°