The two reference points that aid in sketching the ellipse is its foci. The ellipse's foci are equidistant from the origin and located on its primary axis. The locus of a point is represented by an ellipse, where the total of the distances between the two fixed points is a fixed number.
The locus of all locations such that the sum of the distances to two fixed points (the foci) is constant is known as an ellipse. Therefore, by definition, there must be two foci to satisfy this condition.
The eccentricity of the ellipse increases with the distance between the foci. The figure is actually a circle when the foci are stacked on top of one another/
The foci are always evenly spaced apart along the primary (longest) axis. The figure is a circle with both foci at the center of the main and minor axes having the same length. Try to generate this condition by altering the shape of the ellipse above.
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