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Answer:

Alternate interior angles.

Step-by-step explanation:Alternate interior angles are formed when a transversal passes through two lines. The angles that are formed on opposite sides of the transversal and inside the two lines are alternate interior angles

The best describes the relation between x and y is alternate interior angles.

What is alternate interior angle?

Alternate interior angles are formed when a transversal passes through two lines. The angles that are formed on opposite sides of the transversal and inside the two lines are alternate interior angles.

As, AB || CD

and we know between parallel lines the following properties can be used

  • alternate interior angle
  • Corresponding angle
  • Co- interior angle.

Thus, x and y forms alternate interior angle.

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