Flat shapes such as polygons are two-dimensional.
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A shape
Any shape of three or more dimensions. A flat shape, such as a tray, has a thickness - however small - and so is technically a 3-d object.
Sure.A circle is the shape of every possible CUT through a sphere with a flat knife.
There are many. All polyhedra have ONLY flat faces but many other shapes have flat faces such as a hemisphere or an octant or a cylinder.
The surface of a shape is dependent on its shape and dimensions.