When two lines intersect to form a right angle they are called perpendicular.
perpendicular lines
A
These lines are called perpendicular lines.
Lines that intersect at right angles.
When two lines intersect then the degree is called an angle. This does not work with parallel lines.
Lines that intersect but do not form a right are just called intersecting lines. Perpendicular lines DO form a right angle when they intersect.
Such lines are called perpendicular.
a right angle (90degree)
Perpendicular
Perpendiculars.
The lines are said to be 'perpendicular'.