Plane Geometry

• Occurrence of the Conics  - Discussion on the ellipse, the parabola, and the hyperbola. Includes illustrations.
• Perimeter and Area of Polygons  - Interactive lessons that actively engage students and provide them with immediate feedback.
• Pythagorean Theorem  - Presents several geometric proofs to the theorem.
• Tim's Triangular Page  - Presents basic and advanced facts about triangles, and minimum/maximum problems related to triangles.
• Xah: Visual Dictionary of Famous Plane Curves  - Presents famous plane curves and methods of generating new curves. With link to gallery of famous surfaces.