What is the value of \(x^{\circ}\) in this diagram? (2 marks)
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\(\text{Adjacent angle to 144°}\ = 180-144=36^{\circ}\ \ \text{(180° in straight line)}\)
\(x^{\circ}= 180-(90 + 36)=54^{\circ}\ \ \text{(180° in straight line)}\)