"Elementary geometry", offered to the attention of readers, written by the remarkable Russian Soviet teacher Andrei Petrovich Kiselev (1852-1940) . The first book by A. P. Kiselev "Mathematical course of arithmetic for secondary educational institutions" was published in 1884 Then in 1888. "Elementary Algebra" is published, and in 1893 . — "Elementary geometry" . By 1930. the textbook of geometry withstood about forty editions, while constantly improving When working on the textbook A. P. Kiselev kept in touch with the leading teachers of mathematics in our country and carefully studied the issues of teaching mathematics abroad. His work on writing school textbooks A. P. Kiselev continued after the October Revolution. A high appreciation of the pedagogical activity of Andrei Petrovich was the awarding of it in 1933. Order of the Red Banner of Labor . Textbooks A. P. Kiselev withstood a total of about three hundred editions with a total circulation of several million copies. Since the release of the first textbooks A. P. Kiselev and mathematics and school education have come a long way. The increasing role of mathematics in the life of modern society has caused new requirements for the formulation of mathematical education in secondary school. Therefore