Spheres and spheroids have.
Wait ! Don't go away. Any solid of revolution generated by
a plane figure with only curves will have only a curved surface.
a cone.
Zero it has no curved surface
semi-circle
ogeeogee is curved molding
ogee is curved molding
a sphere
A circle or a sphere.
a sphere
curved
a sphere
Cylinder
Cylinder
A cone
A sphere.
sphere.
a rectangle
A line?