You are a 3D shape i have one flat face you have one curved face your flat face is circulart?

Answer 1

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.