Websites for help with geometry
Chapter 7 Special Triangles/ Trigonometry
Math For Morons Like Us
http://library.thinkquest.org/20991/geo/stri.html
Special Triangles
http://hotmath.com/help/videos/samples.html
Chapter 8 Quadrilaterals
Quadrilateral Quest
http://teams.lacoe.edu/documentation/classrooms/amy/geometry/5-6/activities/new_quads/quads.html
Math Warehouse
http://www.mathwarehouse.com/geometry/quadrilaterals/parallelograms/
Chapter 9 Transformations
Geometry Games and Resources OnLine - Many Resources!
http://www.mathsnet.net/transform/index.html
Tessellations - Escher and how to make your own - This site covers tessellations from the practical point of view.
http://www.tessellations.org/
http://www.shodor.org/interactivate/activities/tessellate/?version=1.5.0_16&browser=Mozilla&vendor=Apple_Inc.
Math for Morons Like Us
http://library.thinkquest.org/20991/geo/parallel.html
Math Warehouse - Vectors
http://www.mathwarehouse.com/vectors/
Math Warehouse - Matrices
http://www.mathwarehouse.com/algebra/matrix/index.php
Chapter 10 Circles
Math Goodies
http://www.mathgoodies.com/lessons/vol2/geometry.html