: Sites like Aversev provide free, registration-free downloads of answers for specific manuals, such as "Geometry. Grade 11. Independent and Control Works".
: Websites such as Online Test Pad offer online geometry tests with instant results, which can serve as practice or verification.
: Various apps, such as "Geometry Solver Offline" or "Photomath Geometry," are available on the App Store to solve figures and expressions without an internet connection.
If you are looking for help with specific problems rather than a pre-printed key: