2. A prism has n faces and can cut out n polygons at most.

Cubes can be cut into triangles, squares, rectangles, trapezoid, pentagons and hexagons.

4. An N-polygon can be divided into (n-2) triangles from a vertex, (n- 1) triangles from an edge and N triangles from the inside.

5.① The number of squares in each column in the front view is the maximum number of the column in the top view.

② The number of columns in the left view is the same as the number of rows in the top view.

③ The number of squares in each column in the left view is the largest number in this row in the top view.