Symmetric congruence model, symmetrical half-angle model, rotating half-angle model, self-rotating model, * * * rotating model, geometric maximum model, shear model. Geometric model is a model used to describe geometric information such as shape, size, position and structure of products.

Geometry is the study of spatial structure and properties. It is one of the most basic research contents in mathematics, which has the same important position as analysis and algebra, and has a very close relationship. Geometry has a long history and rich contents.