Answer:
(a) Alternate Exterior Angles
Step-by-step explanation:
Angles at a transversal are described by their location relative to the parallel lines, and their location relative to the transversal.
<h3>Relative to the parallel lines</h3>
Angles that are not between the parallel lines, but are outside the space between the lines are called "exterior" angles.
Angles that are between the parallel lines are called "interior" angles.
<h3>Relative to the transversal</h3>
Angles on the same side of the transversal are called "same side" or "consecutive" angles.
Angles that are on opposite sides of the transversal are called "alternate" angles.
<h3>Angles shown</h3>
The angles numbered in the diagram are outside the parallel lines and are on opposite sides of the transversal. They are ...
Alternate exterior angles.
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<em>Additional comment</em>
Angles in the same place relative to the point where the transversal crosses one of the parallel lines are called "corresponding" angles.
Angles that share a vertex, but not a side, and are formed by opposite rays extending from that vertex are called "vertical" angles. Vertical angles are reflections of each other across their shared vertex.
