It all depends on the shape; different 2D geometrical shapes have different characteristics.
Some specialized geometrical shapes:
Square: 4 sides; 4 equal sides; 2 pairs of parallel sides; 4 right angles (90 degrees)
* A square is a rectangle.
Rectangle: 4 sides; 2 pairs of parallel sides; 4 right angles (90 degrees)
* A rectangle is not a square.
Triangle (equilateral): 3 sides; 3 equal sides; all angles 60 degrees
Triangle (isosceles): 3 sides; 2 equal sides (usually the base is the odd one)
Triangle (scalene): 3 sides; all uneven sides and angles
Rhombus: 4 sides; 4 equal sides; 2 pairs of parallel sides; 4 equal angles
Parallelogram: 4 sides; 1 pair of parallel sides
These are the basic geometrical 2D shapes, but there are others that are more complex.
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No, two dimensional shapes do not have faces
3D shapes are three dimensional, just like 2D shapes are two dimensional.
Polygons are a special type of 2-dimensional shapes.
Two-dimensional shapes are shapes that are flat on the page, such as a square, circle, rectangle, triangle, etc. In contrast, some examples of three-dimensional shapes are cube, sphere, prism, pyramid, etc.
A 2-d shape is a two dimensional shape meaning it is flat.