Perpendicular Lines
Perpendicular lines are two lines that intersect to form right angles (90° angles).
Perpendicular Lines: If two lines are perpendicular, then they form congruent adjacent angles.
Congruent Adjacent Angles: If two lines form congruent adjacent angles, then the lines are perpendicular.
Perpendicular Outer Rays: If the outer rays of two acute adjacent angles are perpendicular, then the angles are complementary.
Learn more about perpendicular lines by reading the explanation below.
Practice: Answer the following exercises about perpendicular lines.