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Linear Pair Perpendicular Theorem
If two angles form a linear pair and are congruent, then they are also right angles and therefore perpendicular.
Perpendicular Right-Angle Theorem
If two lines are perpendicular to each other, then they intersect to form four right angles.
Perpendicular Adjacent Angles Complements Theorem
If the two sides of an angle are perpendicular, then the angles are complementary.
Perpendicular Transversal Theorem
If a transversal is perpendicular to one of two parallel lines, then it is also perpendicular to the other line.
Lines perpendicular to a transversal theorem
If two lines are perpendicular the same line, then they are parallel to each other.