With this article, the journal opens a series of series of articles devoted to the use of the most famous computer tools for subject learning ..... [DT ) Publications begin with a series of articles on Dynamic Geometry, In which the two authors are united, [CM to present the most important and typical features of the tools of this class on the example of the widely used program "The Geometer's Sketchpad" and the recently published domestic product "Mathematical Constructor", issued by 1C. The article contains detailed methodological recommendations to the teacher on the basics of using the class of Dynamic Geometry products . The article also provides exercises to consolidate the material passed