Question

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Explanation:

Step1: Use the property of exterior angle of a triangle

The exterior angle \(x\) of a triangle is equal to the sum of the two non - adjacent interior angles.

Step2: Calculate the value of \(x\)

One non - adjacent interior angle is \(90^{\circ}\) and the other is \(45^{\circ}\). So \(x = 90^{\circ}+45^{\circ}\)

Answer:

\(135^{\circ}\)