Perelman I. and . Live geometry textbook [reprint 1930] 2003 [pdf 154sc 3. 63mb]The book presents only the material that has wide application in practice. It describes the straights, angles, various polygons and circles, prisms, cones, cylinders, and balls. It is told of their properties .. The derivation of formulas for the calculation of area and volume, proof of theorems. Similarity of Figures . Pythagorean Theorem . Initial information from trigonometry. Questions are asked to verify what has been read. P. S. This book was downloaded from your site and had a huge number of errors. Errors are completely eliminated, calculations of examples are checked.