A polyhedron is a

**three**-**dimensional**solid bounded by flat polygonal faces, analogous to a**polygon**in two**dimensions**. The corresponding shapes in four or higher**dimensions**are called polytopes.Also, is a polygon a 2d?

A

**polygon**is a flat, two-dimensional (**2D**) shape with straight sides that is fully closed (all the sides are joined up). The sides must be straight.**Polygons**may have any number of sides. A shape with curved sides is not a**polygon**.What is the difference between 2d and 3d shapes?

You've just learned the

**difference between**a**2D shape**and a**3D shape**. The circle is a two-dimensional (**2D**)**shape**. It only has two measurements, such as length and height, and is usually called a 'flat'**shape**.What is the meaning of 2d and 3d?

**2D shapes**can be summarized by calling them flat

**shapes**. Any

**shape**that can be laid flat on a piece of paper or any mathematical plane is a

**2D shape**. As a child, your first drawings probably used basic

**shapes**, such as squares, triangles, and circles.