two
Chat with our AI personalities
The "conic section" that is produced when you slice a cone with a plane that passes through only one nappe of the cone but that is not parallel to an edge of the cone is known as an ellipse. In the case where the plane is perpendicular to the axis of the cone, the ellipse becomes a circle.
Any closed figure that is not entirely composed of straight sides, such as an ellipse or a circle.
An Ellipse
ellipse
No. Both foci are always inside the ellipse, otherwise you don't have an ellipse.