Distance, often assigned the variable d, is a measure of the space contained by a straight line between two points. Distance can refer to the space between two stationary points (for instance, a person's height is the distance from the bottom of his or her feet to the top of his or her head) or can refer to the space between a moving object and its starting location. Most distance problems can be solved with the equations d = s × t where d is distance, s is speed, and t is time, as well as d = √((x2 - x1)2 + (y2 - y1)2, where (x1, y1) and (x2, y2) are the x,y coordinates of two points.
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