Elementary Solid Geometry and Mensuration

A-BCD adjacent altitude axis B₁ b₂ centre circle arc circumscribed coincide conical surface convex COROLLARY cube cuboid cuts the plane cutting plane cylindrical surface DEFINITION diagonal diameter dihedral angle distance element equal respectively equally distant equivalent face angles figure find the volume four right angles frustum hedron hence homologous lines icosahedron inscribed lateral edges lateral faces lateral surface length line of intersection lower base lune whose angle mid-section nappe octahedron opposite edges parallel planes parallelepiped parallelogram perpendicular plane angle plane geometry plane meet plane section plane ẞ pole polyhedral angle prismatoid quadrants radius rectangle regular dodecahedron regular octahedron regular polyhedrons regular tetrahedron right circular cone right prism right section set of prisms slant height solid sphere spherical excess spherical polygon spherical triangle square straight line surface and volume THEOREM three sides trihedral truncated upper base V₂ vertex vertices