: The standard "blue book" used in most schools. GDZ for this textbook often includes step-by-step proofs for theorems like the law of sines and cosines.
: Operations on vectors, calculating the distance between points, and the equations of lines and circles. gdz po gometrii 9 klass
: Formulas for the area of regular polygons, circumference, and the area of a circle. : The standard "blue book" used in most schools