Free Math Help Geometry provides textbook style lessons, flash video lessons for calculating angles, volume, area, graphs, and trigonometry functions.  There are also links to other geometry resources and a glossary of terms.

From site:  Geometry Student Resources are a collection of free resources for students
studying and/or reviewing a course in high school geometry. 

There are more than 250 downloadable demonstrations to help students understand key concepts in high school geometry.  The geometric demonstrations are interactive so the students and teacher can manipulate data, speed and factors that affect each of them.

Maths is Fun provides comprehensive detailed information on the basics of plane geometry and solid geometry.  The broad variety of geometry shapes is pictured and discussed, as well as angles, drafting tools, transformations and symmetry.

This site provides an interactive overview of 3D shapes including polyhedra, prisms, pyramids, and platonic solids as well as Euler’s Theorem.  Interactive illustrations help to clarify the shape types. There are also instructions for calculating surface area and volume, followed by an interactive quiz.