Symmetry+and+Transformational+Geometry

Symmetry

 * [|The Four Types of Symmetry in the Plane]
 * [|Mathsisfun: Rotational Symmetry]
 * [|Symmetry Web Quest]

Symmetry Transformations

 * [|Interactivate: Symmetry in Tesselations Discussion]
 * [|Mathsnet: Transformations Using Interactive Geometry]
 * [|Totally Tessellated: Symmetry and Transformations]

Congruence

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