It normally defines the shape of an object
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First you have to define the shape in which the length is required. The length then can be established.
The two fixed points are the foci but these do not define the shape of the ellipse. You also need to know the eccentricity.
A number or shape in a pattern.
They're called lines.
i would define the word compare as a number, angle, shape, ect. that is different and try to see what comparisons they have.