Textbook. - M. : Education, 2014. — 175 s. The textbook is the third part of a three-year geometry course for general education schools. The manual is written in accordance with the requirements of the GEF. In the texts there are references of the dictionary with translations and explanations of geometric terms, comments with interesting facts. Task material is diverse and is presented in the headings by type of activity, allowing to form cognitive universal educational actions. After each chapter, repeat tasks and tasks under the heading "Apply computer" are proposed, designed to work with the computer environment. Vectors and coordinates. Concept of vector. Addition and subtraction of vectors. Multiplying vector by number. Vector algebra and vector method. Coordinates. Scalar multiplication of vectors. Tasks to Chapter. Conversions. Basic Concepts . Movement. Symmetry of Figures . Similar to . Tasks to Chapter. Geometry of the circle. They are huddled, huddled, and huddled. Written and described circles. Circle length and circle area. Tasks to Chapter. Conclusion. Subject Index. Answers. List of recommended literature.