19) Find the value of x.

Geometry Solution

In the given figure, we have two parallel lines intersected by a transversal line. The markings on the transversal indicate that it is perpendicular to both parallel lines.

When a transversal is perpendicular to two parallel lines, it forms right angles (90°) at each intersection point.

The angle marked with a square symbol (which represents a right angle) is equal to \( x \).

Therefore, \( x = 90^{\circ} \).

Ответ: x = 90°.