A sphere
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It does not have a flat surface.
A pentagon is a polygon that has 5 sides, 5 vertices and a flat face
none its a sphere just look at one and you can tell
A flat surface, like a sheet of paper, with no edges (ie: it goes on and on and on and on....) or boundaries. What you're describing is a 2 dimensional plane. No, not plane like an airplane. A plane is simply a flat "sheet" that goes on forever in 2 dimensions: left/right (wide) and up/down (tall).
A plane is a flat surface with no thickness