What is the size of the angle marked \(x^{\circ}\) in this diagram? (2 marks)
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\(\text{Interior angle}\ = 180-120 = 60^{\circ}\ \ \text{(180° in straight line)}\)
\(x^{\circ} = 60+50 = 110^{\circ}\ \ \text{(exterior angle = sum of interior opposites)}\)