Perpendicular Lines

Can you draw a pair of intersecting lines such that all four angles are equal? Can you figure out what will be the measure of each angle?

If two lines intersect and all four angles are equal, then each angle must be a angle (°).

Perpendicular lines are a pair of lines which intersect each other at right angles (90°). In the above figure, we can say that lines l and m are to each other.