Perpendicular lines, the theorem of three perpendiculars, and angles between lines and planes.
According to the official school materials , the collection includes: reshenie geometriia goloborodko i ershova 10 klass
Parallel lines, lines parallel to planes, and parallel planes. the theorem of three perpendiculars
The 10th-grade curriculum typically focuses on (3D Geometry). Major units include: the collection includes: Parallel lines