Perpendicular.
Perpendicular Lines form right angles at their point of intersection
They are perpendicular lines
Lines that intersect to form right angles at their point of intersection have slopes that are negative reciprocals.
Perpendicular lines
Perpendicular lines
perpendicular lines
perpendicular lines! :D
They are perpendicular.
Perpendicular
Perpendicular
These are called perpendicular lines.
The lines are called perpendicular lines.