There are many options. Amongst them:
An ellipsoid (including a sphere) intersected by two planes which do not, themselves intersect within the shape;
A paraboloid intersected by two planes which do not, themselves intersect within the shape;
A cone intersected by two planes which do not, themselves intersect within the shape;
A semi-hyperboloid intersected by two planes which do not, themselves intersect within the shape;
A toroid (doughnut) intersected by two planes which do not, themselves intersect within the shape;
An elliptic prism intersected by two planes which do not, themselves intersect within the shape.
The last of these would include a cylinder.
That sounds like a cone. One surface is a circle and the other surface is curved.
Cone
a sphere
A solid hemisphere has two surfaces: one curved surface and one flat circular base. The curved surface forms the outer part of the hemisphere, while the flat base is the circular face at the bottom.
A solid hemisphere has two surfaces: one curved surface and one flat circular base. The curved surface is the outer part of the hemisphere, while the flat base is the circular section that sits on a plane.
a coneType your answer here...
a cone...
That sounds like a cone. One surface is a circle and the other surface is curved.
I may be the upper or lower half of any oblate or prolate spheroid.You'll never know.bwahahaha
Cone
a sphere
A solid hemisphere has two surfaces: one curved surface and one flat circular base. The curved surface forms the outer part of the hemisphere, while the flat base is the circular face at the bottom.
A solid hemisphere has two surfaces: one curved surface and one flat circular base. The curved surface is the outer part of the hemisphere, while the flat base is the circular section that sits on a plane.
A cross section of an ellipsoid or sphere. A cone. A [right] truncated paraboloid (like the reflector of a car headlight). There are several others.
semi-circle
I am a geometric solid, I have two sufraces, One of my surfaces are rectangles, What Am I? Answer: Cone
A solid cylinder has three plane surfaces: two circular bases at the top and bottom, and one curved lateral surface that wraps around the sides. The curved surface is not a plane surface, while the two bases are. Thus, there are two plane surfaces in a solid cylinder.