Solid Geometry

A₁ A₂ ABCDE altitude approach a limit axis b₁ b₂ C₁ C₂ called circle circular sector circumference coincide congruent conical surface contains convex COROLLARY cube cylindrical surface d₁ d₂ Definition Denote dihedral angle distance element equal face angles figure frustum geometry given line given point greatest number h₂ homothetic intersecting lines irrational number l₁ lateral area lateral edges least number less line segment locus of points m₁ m₂ number of sides octahedron parallel lines parallelepiped pencil of planes placed in reverse plane perpendicular points equidistant pole polyhedral angle polyhedron prismatic surface Proof prove R₂ radius ratio of similitude rational numbers real numbers respectively right circular cone right section S-ABC side approaches zero skew lines slant height sphere spherical angle spherical polygon spherical surface spherical triangle straight line surface of revolution symmetrical tangent THEOREM transverse section trihedral vertex vertices volume