Two lines, vectors, planes, etc., are said to be perpendicular if they meet at a Right Angle. In , two
Vectors and are Perpendicular if their Dot Product
In the above figure, the Line Segment is perpendicular to the Line Segment . This relationship is commonly denoted with a small Square at the vertex where perpendicular objects meet, as shown above, and is denoted .
See also Orthogonal Vectors, Parallel, Perpendicular Bisector, Perpendicular Foot, Right Angle