An Ellipse
It will be a hyperbola.
hyperbola
Two nappes of a right circular cone meet at a point called the vertex.
It is the vertex. It can also be called the apex but that has a connotation of being the top-most point and so is not appropriate when both nappes are concerned.
ellipse
A hyperbola
A line is produced
It will be a hyperbola.
hyperbola
hyperbola
if a right circular cone intersects a plane that goes through both nappes of the cone, but not through the vertex, the resulting curve will be a hyperbola
Two nappes of a right circular cone meet at a point called the vertex.
A hyperbola.
Hyperbola
The intersection forms a hyperbola.
Then the intersection is a hyperbola.
An ellipse or circle.