A point is 0-dimensional ... it has no length, breadth or height.
A line is 1-demensional ... it has length, but no breadth or height.
A square, circle, triangle etc is 2-dimensional ... each of them have length and breadth, but no height
A cube, cylinder, sphere etc is 3-dimensional ... each of them have lenght, breadth and height.
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Two dimensional shapes are those that do not have DEPTH. They have only LENGTH and WIDTH whereas a three dimensional shape has LENGTH, WIDTH and DEPTH.
2 dimensional figures just have width and length, if you were to add the height dimension it would become 3 dimensional.
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There are none.A square is a 2-dimensional object and so there cannot be any 3-dimensional objects in it.
solid geometry deals with 3 dimensional figures while plane geometry deals with 2 dimensional.
Solid Geometry