2 circles, square and rectangle
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Surface area of three dimensional figures are measured in square units whereas their volumes are measured in cubic units
Two dimensional geometry is called "plane geometry" meaning that it occurs on a single surface or plane. The objects used in plane geometry are called plane figures.
two figures that make a regular rectangle * * * * * Not so. There is no such thing as a regular rectangle. If there were one, it would be a square and not a rectangle. Furthermore, faces are associated with solid (3-dimensional) objects, not plane figures. A face is any one of the 2-dimensional plane boundaries or surfaces of a solid object. Sometimes the term is also used for curved surfaces.
A square is a 2 dimensional shape, but it can be divided into 2 or more triangles, or more smaller squares, or hexagons and triangles, or octagons and triangles, or really any rectilinear figure and triangles. If you mean what two dimensional shapes can compromise the surface of a cube, or rectangular prism, then you want squares. if you mean what 1 dimensional figures can make the perimeter of a square, then you want lines (straight lines).
I know one of them is a circle