Answer:
Which term best describes the relationship between <1 and <3? --------- Vertical Angle
Which angle is supplementary to <7? ---------- <8
Which of these explains why <4 ≅ <6? ------------ Alternate Interior angles
Explanation:
Vertical angle -- are the angles opposite of each other when two lines cross
Supplementary -- Are angles that add up to 180°
Alternate interior -- are a pair of angles on the inner side of each of those two lines but on opposite sides of the transversal.