Two-dimensional shapes are the ones we are most familiar with: squares, circles, triangles, etc. "Two dimensional" means that they have only length and breadth and no depth, which means they can only exist on surfaces.
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No. It depends on a two dimensional WHAT! A 2-D open curve does not define a shape.
It normally defines the shape of an object
They're called lines.
the difference between a two dimensional shape and and a solid is that a two dimensional shape is plane and a solid you can see the whole shape a the inside.
It is the set of points, in 3-dimensional space, defined by the intersection of two planes which define faces of the shape.
The define the shape and size of a three dimensional object.