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A geometric solid is any enclosed three-dimensional object that contains space and has a finite volume.
A point
A geometric net of a 3-dimensional object is a single two-dimensional figure that can be folded into the 3-d shape.
A point has zero dimensions; a line has only one direction, which is length. Two-dimensional objects have length and width, and therefore area.
A 4 dimensional object is called a Tesseract or "hybercube"Although if you want to get into string-theory and related advanced subject matters, the Tesseract is not a 4 dimensional object at all, but simply an advanced 3 dimensional object which only represents the 4th dimension; a visual aide if you will.