In the figure, x ∥ y and a is a transversal line that crosses the parallel lines.
∠2 and ∠8 form alternate exterior angles.
Given two parallel lines X and Y and a is transversal
Alternate exterior angles
are a pair of angles on the outer side of each of those two lines but on opposite sides of the transversal.
When lines are parallel to each other the alternate exterior angles are equal.
∠3 and ∠5 are alternate opposite angles.
∠4 and ∠6 are alternate opposite angles.
∠2 and ∠6 are corresponding angles.
∠2 and ∠8 are alternate exterior angles.
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