An oblique prism has two parallel faces, the other face is a quadrangle, and the public sides of every two adjacent quadrangles are parallel to each other. The geometry surrounded by these faces is called a prism.

Oblique prism: A prism whose side is not perpendicular to the bottom is called an oblique prism. When drawing an oblique prism, the side is generally not perpendicular to the bottom. Straight prism

Definition of right-angle prism:

A prism whose side is perpendicular to the bottom is called a straight prism.

Characteristics of right-angle prism:

1, with the side perpendicular to the bottom.

2. The sides are equal in length and height.

3. The sides and diagonal faces are rectangular.

4. The side development diagram is rectangular.

5. lateral area = bottom perimeter × side length.

6. Volume = bottom area × side length

Question: A necessary and sufficient condition for a prism to become a straight prism is ()

One side is perpendicular to the bottom surface

B one side is perpendicular to both sides of the bottom surface.

C, one side is square, perpendicular to the bottom.

D, there are two non-adjacent sides perpendicular to each other.

A: A B A regular prism is a straight prism whose side is perpendicular to the bottom surface, and the bottom surface is a regular polygon.

Special attention: the bottom is a regular polygon with sides perpendicular to the ground, but the length is not necessarily.

The side of a straight prism is also perpendicular to the bottom surface, and the length is not necessarily, but the polygon shape of the bottom surface is not necessarily.