length times(x) width
* * * * *
Very few 2-dimensional figures are measured by length and width - rectangles (and stretching the terminology) triangles and parallelograms. Certainly not circles, stars, irregular polygons, other irregular shapes.
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Plane figures.
a two dimensional figure is flat. it only has length and width. three dimensional figures have length, width and height. A square is a 2 dimensional figure, but a cube is a 3 dimensional figure.
Two three dimensional figures that have circular bases: Cone, and Cylinder.
For example, if you keep on stacking squares (two dimensional figure) on top of one another, it will slowly form a cuboid (three dimensional figures). There is a mathematical way of calling it. Google it!
Because they are dimesional figures either way!