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Solving Problems, SM-Bank 016

In the diagram below, find the value of \(a^{\circ}\), giving reasons for your answer.   (2 marks)
  

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\(46^{\circ}\)

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\(\text{Since cointerior angles sum to 180°:}\)

\(180^{\circ}\) \(=a+60+74\)  
\(a^{\circ}\) \(=180-134\)  
  \(=46^{\circ}\)