These sites focus on visual-spatial skills. Includes information about orthographic and isometric projections, rotation of objects from different axes, cutting planes and cross-sections, object reflection and transformation, and symmetry. There are suggested ideas, simulations, and activities that can be used to promote visual and spatial skills. There is a link to eThemes Resource on Geometry: Symmetry.
This site provides information about basic formal drawing techniques including isometric projection, planometric and perspective drawings, and working drawing. There is a quiz at the end of a unit. Note: The "Talk" is a link to discussion forum.
These sites offer many examples of how symmetry works in a variety of shapes. Find out the difference between reflection and rotational symmetry. Includes interactive sites that let you draw symmetrical shapes and manipulate them. There is a link to an eThemes Resource on tessellations.