The nineteenth book of the series "School Mathematical Circles" is devoted to solving geometric problems using dynamic geometry programs - "Geogebra," "Living Mathematics," "Mathematical Constructor." After studying the book, the student will learn to work in the dynamic geometry program, build and study moving drawings, master the basic techniques of a mathematical experiment in solving complex problems - putting forward, testing and refining hypotheses - and also repeat the main topics and ideas of the planimetry course. The book is addressed to school teachers of mathematics and leaders of mathematical circles.