It is the locus of a point such that the sum of its distance from two (distinct) fixed points is a constant.
So, given two fixed points, F1 and F2, an ellipse is the locus of the point P such that PF1 + PF2 is a constant.
That would be an ellipsoid, a 3 dimensional thing. The 2 distances have to be measured in a fixed (2 dimensional) plane.
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slope
a cluster full of numbers
In math terms commission is the amount of money a salesclerk receives on a sale. A salesclerk receives a commission with their salary.
a numerical quantity that is not a whole number
Lines opposite each other