If two straight lines are perpendicular to a line l, then they are
The angle between the two lines is 180o
Parallel to each other
The lines intersect each other when extended
Perpendicular to each other
When two lines are perpendicular to the same line, sum of interior angles on same side is 180o. Hence the lines are parallel to each other.
If two straight lines are perpendicular to the same line, prove that they are parallel to each other.