: Great for quick access on mobile. It often includes video explanations for the more difficult proofs and construction problems.
Since this is a very common textbook in Russia, you can find free, step-by-step solutions on several reliable platforms. Here are the most popular ones: gdz po geometrii klass pozniak iudina atanasian besplatno
: Likely the most comprehensive site. It includes scanned handwritten solutions and typed versions for almost every exercise in the book. : Great for quick access on mobile