It has two dimensions of length: whether you call them length, breadth, height or width depends on the orientation of the shape and your preference.
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A television set is a 3D shape. The image (picture) on the television screen is a 2D shape. 3D is when it has length, width, and height. 2D is only length and width.
A 2-D shape is a shape that does not pop out.
The 2 dimensions of 2d shapes and length and breadth.
volume is equal to length x breadth x height
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.