When searching, make sure you are looking at the correct chapters. The 11th-grade curriculum typically focuses on:
The most popular database. It usually offers step-by-step handwritten or typed solutions for every exercise in the Atanasyan 10-11 textbook.
Most points in geometry are lost because of incorrect spatial drawings. Use the GDZ to see how to properly project 3D shapes onto a 2D page.
Since you are looking to "download" or access these materials, 1. Where to Find Them (Online Resources)
Calculating surface areas and volumes. Volumes of Polyhedrons: Prisms and pyramids.