The absolute value of a number is the distance from zero on the number line. l3l means it is 3 points from zero. But what about l-5l. the negative sign indicates that the specified number exists on the left side of the number line and it is also 5 points from zero. From this it is clear that absolute value of any number is greater than or equal to 0. After all, there is no such thing as a negative distance. The above examples are on a single plane. When we consider two dimensional points (those with two coordinates {2,1}, {3,2} etc) the same definition holds. It is the straight line distance from zero to that specified point.

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