When taking a group photo, the triangle refers to the shape of the person's position.

Triangular composition is often used for scenery shooting. The triangle can be an equilateral triangle, an isosceles triangle or an oblique triangle. Generally speaking, the oblique triangle will be used more because it is more flexible, and the use of triangle composition in portrait photography will also bring a sense of stability and harmony. Triangular composition is widely used when shooting people sitting. The head, hands and feet (or knees and hips) are distributed in a triangle, which can make the posture more natural. In photographic composition, there are usually two methods to construct triangles. One is that there is only one subject in the graph, and the three points of this subject can just form a stable triangle. In another case, there are many subjects in the picture, and these subjects are constructed into triangles in the picture by using different shooting angles and different shooting positions to achieve the effect of triangle composition.