sphere
A triangle with a circular base
A cylinder has a circular face at each end, and a rectangular face folder around the middle. The only edges are the edges of the circular ends.
3D shapes with only one face shape are known as uniform polyhedra, with the most notable examples being the cylinder, cone, and sphere. The cylinder has two circular faces but is considered to have one face type. In contrast, the cone and sphere each consist of a single surface, with the cone having a circular base and the sphere being entirely curved. These shapes exhibit uniformity in their face geometry.
A solid figure with one circular base and one curved surface is called a cylinder. In a cylinder, the circular base is parallel to the other circular base (if there is one), and the curved surface connects the edges of the base, forming a three-dimensional shape. If it has only one base, it can be considered a cone, which has a circular base and a single curved surface that narrows to a point.
The top view of a cone is a circular shape, representing the base of the cone as seen from directly above. In this view, the apex of the cone is not visible, and only the circular outline of the base is displayed. The radius of the circle corresponds to the radius of the cone's base.
There is no shape which has only circular faces.
A solid figure with one circular base and one curved surface is known as a cylinder. In a cylinder, the circular base is connected to a curved surface that wraps around the sides, extending vertically between the two circular bases if there are two. If it has only one circular base, it can be considered a conical shape, such as a cone, which tapers smoothly from the base to a point. However, the specific description you provided matches a cylinder more closely, assuming it has two circular bases.
The base of a square pyramid is the only face that is a square - all the others are triangular in shape. So you do not need any measurements to determine which is the base.
The shape you are describing is a cylinder. A cylinder has two circular faces, which are also known as bases, and one rectangular face, which is called the lateral face. The lateral face of a cylinder is formed by unrolling the curved surface of the cylinder into a flat shape, creating a rectangle.
Its a sphere.
A cone has one circular face. It only has one vertice and it does not have any edges since the face is circular.
A cone does not have a flat surface; it is a three-dimensional geometric shape with a circular base and a pointed apex. The surface of a cone is curved, extending from the base to the apex. However, the base itself is flat, which is the only flat part of the cone.