Respuesta :
The line a and line d are perpendicular to each other.
What is a perpendicular line
A perpendicular line is a line that intersect another line at 90 degrees. Perpendicular lines are also called normal lines.
Constructing lines a and d
After constructing the two lines; line a and line intersect or meet each other at 90 degrees to the horizontal.
Thus, we can conclude that the line a and line d are perpendicular to each other.
Learn more about perpendicular lines here: https://brainly.com/question/1202004