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A collection of 43 proofs - some interactive - of the Pythagorean theorem.
www.cut-the-knot.org
Xah: Visual Dictionary of Special Plane Curves
A Visual Dictionary of Special Plane Curves with graphics.
www.xahlee.org
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.
www.mathgoodies.com
Discusses the differences between the different types of these straight sided figures. Also, explains the difference between regular and irregular shapes.
www.ul.ie
Explains the basic properties, formulas, theorems and different types of triangles. Includes proofs and illustrations.
sakharov.net
Images of conics by Jill Britton.
britton.disted.camosun.bc.ca