a circle has no face a sphere on the other hand does
The answer is - a cone.
Cylinders
A cylinder is one possibility, there are others.
If you have one flat face and I have one curved face, which one of us is the 3d shape? Anyway, a 3d shape with pne f;at, circular face and one curved face could be: a section of a sphere or a section of an ellipsoid cut by a plane parallel to one of its axes, a section of a paraboloid or a cone. There are probably other shapes.
A cone. It has a circle for the base, and a curved face tapering to a point.
a circle has no face a sphere on the other hand does
The answer is - a cone.
Semi Circle
Cylinders
2D = semi circle 3D = hemisphere
cylinder circle
A cylinder is one possibility, there are others.
It could be a semi-sphere but mostly it's a cone.
There cannot be such a shape. It is not a cylinder because a cylinder sdoes not have a rectangular face. A rectangle must be a flat face and the only flat faces in a cylinder are the circle faces. The curved face can be "opened out" into a rectangular shape but because the face is curved it cannot be rectangular.
a cone
If you have one flat face and I have one curved face, which one of us is the 3d shape? Anyway, a 3d shape with pne f;at, circular face and one curved face could be: a section of a sphere or a section of an ellipsoid cut by a plane parallel to one of its axes, a section of a paraboloid or a cone. There are probably other shapes.