: Advanced properties, including inscribed and circumscribed polyhedra.
: Perpendicular lines and planes; theorems on three perpendiculars; distances and angles in space. smirnova geometriia uchebnik - klass gdz
: Central, axial, and mirror symmetry in space; types of movement (isometry). Grades 7–9: Planimetry (Plane Geometry) : Advanced properties
: Calculation formulas for all major 3D shapes, including the use of Cavalieri's Principle . theorems on three perpendiculars
This stage focuses on properties of figures in three-dimensional space. The content is typically divided as follows: