An impossible event is sometimes described in equations that involve division
by zero. For example, the length of a rectangular field can be determined by
dividing its area by its width. As an equation, this is written as l = a/w.
If the width of the field, w, is equal to zero, then it would be impossible
to determine the length of the field. In fact, without a width, it would be
impossible for the field to have any area since area is based on having two
dimensions.
