To find the value of x, let us first solve for the value of the last interior angle. In order to do that, let's equate the sum of the interior angles including the unknown to 540°.
The sum of the interior angles of a pentagon, polygon with 5 sides (n), is 540°.
An exterior angle of a polygon is formed by one side anf the extension of an adjacent side at a vertex of the polygon.
Corresponding interior and exterior angles are supplementary, they add upto 180°.
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