Name a solid with one surface?

Answer 1

3

Answer 2

Well.. A sphere is a solid with only one surface. !

(Oh and the person who answered this before me didnt think about all the solids!)

Or if youre a surface with only one distinct sufaces/sides, or something that have no distinct inside and outside. Sphere have two distinct surfaces -- inside and outside, but they are, well, "joined" in a sense. What you will need is a Klein bottle. This object have only one side -- outside, inside whatever you want to call it, but there is only one surface.

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The second person did not think of all the solids either! A solid sphere does have only one surface, as do ellipsoids, tori, paraboloids, etc. And those are just the less irregular ones.