http://www.mathforum.org/library/drmath/sets/high_geom.html
Ask Dr.Math: this deals with any problems with geometry theorems etc. [higher-level students only].
http://www.easymaths.com/shape_main.htm
Space, shape and measure: a concise, easy-to-read site which gives a good run down on all the terms you need to know for shapes and measure.
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