1, space geometry can be divided into polyhedron and revolution, including cylinder, cone, platform, sphere and combination.

2. In parallel projection, oblique projection and orthographic projection have the same shape and size as the original image.

3. Yes, such as similar graphics.

4. Square and rectangle are plane figures, while cube and cuboid are three-dimensional figures and special quadrangular prisms. All sides of a cube are squares, and all sides of a cuboid are rectangles or squares.