No.
No. Both foci are always inside the ellipse, otherwise you don't have an ellipse.
False
Two
A circle is an ellipse with an eccentricity of zero. Both foci of that ellipse are at the same point. In the special case of the circle, that point is called the "center".
No.
No.
No.
No. Both foci are always inside the ellipse, otherwise you don't have an ellipse.
No. Both foci are always inside the ellipse, otherwise you don't have an ellipse.
No, and there are two of them!
False
An ellipse has 2 foci. They are inside the ellipse, but they can't be said to be at the centre, as an ellipse doesn't have one.
An ellipse, a hyperbola.
Foci.
yes
Yes.