Symmetry

Reflection Symmetry

http://www.youtube.com/watch?v=6qNB2LsgC8Y

Rotational Symmetry App

http://www.analyzemath.com/Geometry/rotation_symmetry.html

Rotational Symmetry App

http://www.learner.org/courses/learningmath/geometry/session7/part_b/index.html

Symmetry in Nature

http://www.youtube.com/watch?v=IGKLZ3NO9Qk