This is the standards chapter in the Principles and Standards for School Mathematics of the National Council of Teachers of Mathematics. Select Geometry from the left column for across-the-grades standards. For specific grade level standards select Pre-K - 2, 3 - 5, or 6 - 8, from the top row. (
http://standards.nctm.org/document/chapter3/index.htm
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Thirty activity links on symmetry and tessellations – from painted Ukranian eggs to M.C. Escher. (
http://ccins.camosun.bc.ca/~jbritton/jbsymteslk.htm
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