Congruent+and+Similar+Polygons

Congruence

 * [|Math.com: Congruent Figures]
 * [|Regents Math: Congruence]

Similar Figures: Corresponding Sides & Angles, Scale Factor, Scale Factor's Effect on Area

 * [|Algebra Lab: Sample Exercises about Similar Polygons]
 * [|Descartes 2D: Similar Polygons--Interactive Applets]
 * [|Math.com: Online Tutorial on Similar Figures]
 * [|Regents Math : Similar Polygons: Ratio of Perimeters & Areas]