A directed distance is a distance that may be positive or negative. By convention, distance is usually taken to be a positive quantity. In analytical geometry, a directed distance may be used. This is useful for measuring the distance of a point from the origin.
a positive directed distance is to the right, up, or towards the viewer. A negative
distance is to the left, down, or away from the viewer. One example of directed distance
is a number line with negative numbers.
|Figure 1: Directed distance on a number line.|
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