Its an Cylinder
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 3D shape called a cylinder
Hemisphere That is a ball chopped in two.
A cylinder or a frustrum of a cone.
A sphere intersected by a plane, which could be a hemisphere. Alternatively, a cone, or a paraboloid.
Curved and flat faces.