Occurrence of the Conics  
   Images of conics by Jill Britton.
   http://ccins.camosun.bc.ca/~jbritton/jbconics.htm

Pythagorean Theorem  
   A collection of 43 proofs - some interactive - of the Pythagorean theorem.
   http://www.cut-the-knot.org/pythagoras/index.shtml

Thinkquest Library's Geometry Page  
   Covers rules for angles, right triangles and plane figures. Also, has a trigonometry section.
   http://library.thinkquest.org/10030/geocon.htm?tqskip1=1&tqtime=0420

Xah: Visual Dictionary of Special Plane Curves  
   A Visual Dictionary of Special Plane Curves with graphics.
   http://www.xahlee.org/SpecialPlaneCurves_dir/specialPlaneCurves.html

Lessons on Perimeter and Area of Polygons from Math Goodies  
   Discusses the perimeter of polygons, area of trapezoids, and challenge exercises. Available on CD only are the area of triangles and parallegrams, as well as practice exercises with solutions.
   http://www.mathgoodies.com/lessons/toc_vol1.shtm

Polygons  
   Discusses the differences between the different types of these straight sided figures. Also, explains the difference between regular and irregular shapes.
   http://www.ul.ie/~cahird/polyhedronmode/polygons.htm