You can add numbers. Usually it doesn't really make sense to add points.
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It is the locus of points such that the sum of their distance from two distinct fixed points is a constant.
http://en.wikipedia.org/wiki/Elipse
It is not possible to have a number such as 2.959.25 - with two decimal points!
173, excluding the two end-points.
-- take the difference between the 'x' values of the two points; square it -- take the difference between the 'y' vales of the two points; square it -- add the two squares together -- take the square root of the sum The result is the distance between the two points.