Triangle
Plane
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A two dimensional object has a length and a width. In comparison, a three dimensional object has a length, a width, and a height.A square and a circle are two examples of two dimensional objects. When you draw them on paper, you are only drawing them in two dimensions. They do not come out of the paper, as they have no height.If they did have height, they would be three dimensional and would respectively be called a cube and a cylinder.
In two dimensions, the equations of rotation about the origin are: x' = x cos t - y sin t y' = x sin t + y cos t. where t is the angle of rotation, counterclockwise.
The difference between arithmetic and geometric mean you can find in the following link: "Calculation of the geometric mean of two numbers".
A plane has two dimensions, length and width.
The differences between arithmetic and geometric mean you can find in the following link: "Calculation of the geometric mean of two numbers". Cheers ebs