The Геометрия 7-9 класс is an Android application designed to assist students in studying the concepts of geometry. This full-version program is developed by Cor and categorized under Education & Reference.

The app offers an in-depth explanation of the spatial structures, relations, and their generalizations that comprise the field of geometry. It also explores the classification of geometry according to the invariance of geometric objects under various transformation groups, which was first proposed by Felix Klein in his "Erlangen Program."

The program delves into the study of the mutual arrangement of bodies, their sizes, and transformations. It provides an abstraction of geometric bodies, such as points, lines, and surfaces, and defines their spatial relationships. The app enables users to study the properties of geometric objects that remain invariant under specific transformations, such as Euclidean geometry, projective geometry, and affine geometry.

Overall, Геометрия 7-9 класс is an excellent educational tool for students who want to learn the fundamental principles of geometry in a comprehensive and accessible way.