The figure below shows parallel lines cut by a transversal: A pair of parallel lines is shown, cut by a transversal. Angle 3 is
located in the upper right exterior corner on the top line, and angle 4 is located in the lower left exterior corner of the bottom line. Which statement is true about ∠3 and ∠4?
These angles are outside the "block" created by the parallel lines and are on opposite sides of the transversal. This is the definition of alternate exterior angles, so that is what these angles are.
