3.4 Perpendicular lines
_3-4-1 If two intersecting lines form a linear pair of congruent angles,
then the lines are perpendicular.
3-4-2 (Perpendicular Transversal Theorem)In a plane, if a traversal is perpendicular to one of two parallel lines, then it is
perpendicular to the other line.
3-4-3 If two coplanar lines are perpendicular to the same line, then the two lines are parallel
to each other.
then the lines are perpendicular.
3-4-2 (Perpendicular Transversal Theorem)In a plane, if a traversal is perpendicular to one of two parallel lines, then it is
perpendicular to the other line.
3-4-3 If two coplanar lines are perpendicular to the same line, then the two lines are parallel
to each other.