Here are links to sites you might find useful:
OUR CURRENT GEOMETRY TEXTBOOK:
http://connected.mcgraw-hill.com/connected/login.do
Some great supplemental video lessons:
http://brightstorm.com/math/geometry/
http://www.khanacademy.org/#geometry
Proofs:
http://www.sparknotes.com/math/geometry3/geometricproofs/summary.html
http://www.dummies.com/how-to/content/mastering-the-formal-geometry-proof.html
http://zimmer.csufresno.edu/~larryc/proofs/proofs.html
Geogebra:
https://www.geogebra.org/
Tutorials, examples, and extra practice:
http://interactmath.com/ChapterContents.aspx
Lessons and more:
http://coolmath.com/reference/geometry-trigonometry-reference.html
http://coolmath.com/0-geometry-math-art.html
Preview the latest version of Sketchpad:
http://www.keypress.com/x24070.xml
Geometric constructions:
http://www.mathsisfun.com/geometry/constructions.html
Practice with a protractor:
http://www.amblesideprimary.com/ambleweb/mentalmaths/protractor.html