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 , a Line with Slope is Perpendicular to a Line with Slope . Perpendicular objects are sometimes said to be ``orthogonal.''

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 .

© 1996-9

1999-05-26