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Answer : 1 225 deg Explanation : Answer: A) 225 deg Explanation: Angle of triangle = 180 × 3/12= 45 degOther angles of the triangle are = 60 deg, 75 degAngle of quadrilateral= 360 - (45 60 75) = 180 degTherefore, the four angles of the quadrilateral are 45, 60, 75