guadrilateral
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if you multiply all the points by one you get the same points so the shape stays the same.
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.
the foci (2 focal points) and the distance between the vertices.
A seven sided shape is a heptagon.
A 7 sided shape is called a heptagon.