Four Angles Subtended by Opposite Edges at the Point of Contact of the Face with Inscribed Sphere

Intersection of Six Planes

Symmetry Property

Monge Point

Mannheim's Theorem

Circumscriptible Tetrahedron

Conic Section

Space Curve Projected into Circle and Parabolas

Sphere, Cone, Cylinder, Parabola, Hyperbola

網站

幾何作圖 2004

Cabrilog http://www.cabri.com/web/nsite/html/software.html

Evaluation

參考資料

N.A. Court, Modern Pure Solid Geometry