the cone.
cone
cone
A cone.
A pyramid has 1 square base.
It has 1 circular edge at its base
A cylinder.
A 3D shape with one vertex is called a cone. It has a circular base and a single apex (the vertex) where all the lines from the base converge. The shape tapers smoothly from the base to the vertex, creating a pointed top. Other examples of shapes with one vertex include certain types of pyramids, but cones are the most common reference for this characteristic.
A 3D shape with one curved face is a cylinder. It has a circular base and a curved surface that connects the two bases. The curved face wraps around the side, while the top and bottom faces are flat circles.
A hemisphere has 1 circular face and one which is half the surface of a sphere.
Cone
hemisphere
A cone.