The 22nd edition (2013) is available for online viewing and download in multiple formats (PDF, EPUB, Full Text) via the Internet Archive .
A specific PDF solution guide (GDZ) by V.Yu. Fadeev for the Atanasyan textbook (384 pages) can be found at Somif . Interactive Online Solutions gdz po geometrii 10-11 klass atanasian
If you prefer browsing by exercise number rather than a static PDF: The 22nd edition (2013) is available for online
Provides a comprehensive digital reshebnik (answer key) for Grade 10-11 geometry materials, including control works. gdz po geometrii 10-11 klass atanasian
You can find the textbook and its corresponding solution guides through the following resources:
The "GDZ" (Gotevye Domashnie Zadaniya) for the textbook by L.S. Atanasyan provides worked-out solutions and answers for students to verify their homework.