Question

1. a line of reflection is also know as a parallel line a line of symmetry a perpendicular only, a line of reflection

Explanation:

A line of reflection is a line that acts as a mirror, and it is equivalent to a line of symmetry. A line of symmetry divides a figure into two congruent parts that are mirror images of each other. A parallel line has no relation to reflection. A perpendicular is a type of angle relationship (90 - degree). Saying "only, a line of reflection" is redundant as the question is asking for an alternative name.

Answer:

a line of symmetry