When a circular cone is intersected by a plane at only its vertex, the resulting shape is a single point, which is the vertex itself. There are no other intersecting points along the surface of the cone. Thus, no additional geometric figure is formed beyond this singular point.
When a right circular cone is intersected by a plane that passes through its vertex and touches the edge of each nappe, the resulting shape is a triangle. This triangle is formed by the intersection line extending from the vertex to the edges of the cone's surfaces, effectively creating a triangular cross-section of the cone.
If a right circular cone intersects a plane that runs parallel to the cone's axis but does not pass through its vertex, the resulting curve is a pair of hyperboles.
If a right circular cone intersects a plane that runs perpendicular to the cone's axis but does not pass through its vertex the resulting curve will be a circle.
No but it has a circular edge
An Ellipse
It will be a hyperbola.
hyperbola
hyperbola
A line is produced
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 point.
If I understand your description correctly, a line.
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.
The intersection will consist of only one point.
Acute angles.