One,
it doesn't have any side
Ben drew an ellipse as a plane curve with edges not parallel to its axis.
An ellipse looks like three dots or periods: ...
4
6
Ellipse has no sides and
it doesn't have any side
A shape can have one side, as in a circle or an ellipse; and there are no limits to the maximum number of sides a polygon can have.
No, polygons are made of straight, non-overlapping sides. An ellipse has curves.
An ellipse.
There are infinitely many 2d shapes. They can have 1 side (a circle or ellipse) to infinitely many. They can have sides that are straight or not, the sides can be equal or unequal in length, the angles can be equal or unequal, etc.
Well, honey, an ellipse technically has zero sides and zero corners. It's a curved shape, not a polygon. So, if you're looking for straight edges and sharp corners, you're barking up the wrong tree with an ellipse.
A closed figure with no straight sides could be a circle, an ellipse, or an irregular loop.
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.
In a right circular cone the base is a circle and the sloped side is a sector of a circle. For a general cone, they are an ellipse and a sector of an ellipse.
Circle, triangle, oval, ellipse, & irregular shapes
Infinite number of shapes: there is no limit. Not all have sides in the usual sense: e.g., you could say a circle (or an ellipse or a kidney-shape) has one and a crescent has two, but they're curvesd, not straight.