Geometry websites for lots of topics:
http://classroom.jc-schools.net/basic/mathgeom.html
http://resources.woodlands-junior.kent.sch.uk/maths/shape.htm
http://www.aasd.k12.wi.us/staff/boldtkatherine/MathResources3-6/Math_Geometry.htm#Symmetry
Geometry Vocabulary:
http://www.aplusmath.com/cgi-bin/flashcards/geoflash
http://www.aplusmath.com/cgi-bin/games/geomatho
Lines:
http://www.ixl.com/math/grade-7/lines-line-segments-and-rays
http://www.ixl.com/math/grade-7/parallel-perpendicular-intersecting
http://www.nelson.com/mathfocus/grade7/quizzes/ch07/mf7_ch._7_lesson_7try.htm
Angles:
Measuring Angles with a Protractor:
http://www.mathplayground.com/alienangles.html
http://www.mathplayground.com/measuringangles.html
Triangles:
http://www.factmonster.com/math/knowledgebox/player.html?movie=sfw41507
http://www.crickweb.co.uk/ks2numeracy-shape-and-weight.html#triangles
http://www.studystack.com/matching-174735
Similar and Congruent:
http://www.harcourtschool.com/activity/similar_congruent/
http://www.beaconlearningcenter.com/weblessons/congruentconcentration/default.htm
Symmetry:
http://www.aasd.k12.wi.us/staff/boldtkatherine/MathResources3-6/Math_Geometry.htm#Symmetry
http://www.innovationslearning.co.uk/subjects/maths/activities/year3/symmetry/shape_game.asp
http://www.free-training-tutorial.com/math-games/symmetry-lines.html?1&