According to the decision of the Ministry of Education of the RSFSR, an addition (150 tasks) is included in the 13th edition of the Collection of Geometry Problems. The supplement mainly contains tasks of increased difficulty, as well as tasks that are distinguished by an unusual approach to finding a solution. It should be noted that in some cases the solution of these problems is simplified when using geometric transformations. These tasks can be used in the study of program material and in elective classes.