How many positions are there to shoot the dialogue scene on the 180 degree axis?

There are three common forehand and backhand positions when shooting the dialogue scene on the side of 180 degree axis. Backshot, also known as backhand. When this term is used, it is usually called backhand or backhand. This is a skill and term often used in film and television photography, which usually refers to shooting from the front, back or side of the front lens and camera. Backhand is usually called outer backhand and inner backhand. In a conversation scene between two people, an axis is usually set, which is a virtual relationship line between two people. When shooting, there are three basic seats forming a triangle, all on the same side of the axis. The one at the top of the triangle.