A cone
A three-dimensional shape with one circular base connected by a curved side to a single vertex is called a cone. The base is a circle, and the curved side extends from the edge of the base to the apex, or vertex, at the top. Cones can be found in various applications, such as ice cream cones or traffic cones.
You're probably thinking of a cone. There is some disagreement as to whether the point of a cone qualifies as a vertex.
This figure is a CONE.
cone
A three-dimensional figure that has no vertices and one circular base is a cylinder. It consists of two parallel circular bases connected by a curved surface. The absence of vertices distinguishes it from other shapes like cones or prisms. The circular base allows for uniform cross-sections along its height.
Because the base of a cone is round, it is the only three dimensional figure with only one vertex.
A cone.
A circle could be, and I think that an ellipse also could be.
A polyhedron is a three-dimensional figure formed by flat surfaces that are bounded by polygons joining along their sides (the faces of the polyhedron).A circle is not a polygon, but we can say that a circle is the limit of a regular polygon with n sides. It means that if n becomes larger and larger, the polygon shape approaches to a circle. A circle is a two dimensional figure as a polygon is, but a three dimensional figure whose base(s) is/are a circle cannot be called a polyhedron.
trapezoid
The line or plane upon which a geometric figure is thought of as resting is called the base. A three-dimensional figure with a circular base and the top meeting at a vertex; it resembles a funnel cone.
You're probably thinking of a cone. There is some disagreement as to whether the point of a cone qualifies as a vertex.
A cone.
This figure is a CONE.
cone
A spitial figure with a circular bases no edges and one vertex
A right cylindrical cone has a circle for a base and one vertex. a diagram is shown on unitmath.com