Correct Answer: Option D

Explanation

From the diagram, the angles in the triangle are:

(180 - a)°, (180 - b)° and x°.

\(\therefore\) (180 - a) + (180 - b) + x = 180°

360 + x - a - b = 180°

360 - 180 + x = a + b

180 + x = a + b.

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