Answer:
x = 24°
Explanation:
See the attached worksheet. Let a and b stand for the two unknown angales as shown on the worksheet. Since the sum of angles across a straight line is 180°, we can express the two angles as:
a = 180°-x, and
b = 180° - 111° or b = 69°
The sum of the interior angles of a quadrilateral is 360°. Set the four angles equal to 360° and solve for x.
x = 24°