I may be the upper or lower half of any oblate or prolate spheroid.
You'll never know.
bwahahaha
That sounds like a cone. One surface is a circle and the other surface is curved.
a coneType your answer here...
Cone
a cone...
semi-circle
A cone.
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The curved outer surface of a circle is the perimeter.
A sphere has a total curved surface. A cylinder and a cone have a partial curved surface
a sphere has no bases and it only has one curved surface
curve surface area
A cone has one curved surface.