Liquid
liquid has a definite volume and takes on the shape of its container.
The two foci are necessary to define the location of an ellipse, but the shape depends on the eccentricity, which is related to the lengths of the two axes.
Irregular or without a definite shape.
Compound words using 'one' are onesided (argument), onedimensional (flat), onetime (as a modifier).
Yes
a shape that has a length and height, but no width.
It normally defines the shape of an object
we have invertibrate skelatons Get a revision book idiot
sqare
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.