Direction (geometry)

In geometry, direction means the way something points or faces. It helps us see how lines, rays, and shapes relate to each other. For example, when you draw a straight line, the direction shows which way the line is pointing. Two lines or rays that point the same way are called codirectional.

Directions can be shown using special math tools called vectors. A unit vector is a vector that has a length of one and points in a specific direction. In two dimensions, like on a flat piece of paper, a direction can be described by an angle. In three dimensions, like in the real world around us, directions need two angles to describe them fully.

Directions are useful in many areas, such as showing the angle of a spinning object or describing the tilt of a surface. Understanding direction helps scientists, engineers, and artists make accurate models and designs.