Perpendicular lines intersect each other at right angles (90°) .
Perpendicular lines make right angle, i.e., 90∘ with each other.
Two lines intersecting each other at right angle are said to be ______ to each other.
Perpendicular lines make right angles with each other.
In the figure, if chords AB and CD of the circle intersect each other at right angles, then x+y=