A one dimensional object wouldn't really exist, if you know geometry, think a point or a line except the point or line isn't really visible, because it doesn't actually exist. 2D is more like a plane in geometry. Think a piece of paper, except it doesn't have any volume. Essentially, 1D just is, while 2D has length and width. Only when you get to 3D and have length, width and height do you actually have a object that exists.
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An octagon is 2-dimensional, an octahedron is 3-dimensional.
1. The difference of two numbers are the numbers between them. The difference is found by subtracting the smaller number from the larger. In this case, 2 is subtracted from 3 (3-2) with a difference of 1. 3-2=1
It is the difference between the coordinates of two points in 2-dimensional space, measured in the horizontal direction.
The difference is that two-dimensional shapes have a length and a width while three-dimensional shapes have a length, width, and depth. While some examples of two-dimensional shapes are circle, rectangle, and triangle, example of three-dimensional figures are a sphere, cuboid, and a pyramid.
A solid angle is 3-dimensional, a planar angle is 2-d.