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4434MathNet: Transformations using Interactive Geometry
http://www.merlot.org/merlot/viewMaterial.htm?id=83264
Develop your transformations skills. You will be able change shapes using rotations, reflections, translations or enlargements The focus of these resources are the five areas, rotations, reflections, translations, enlargements and combinations of them, covering the High School curriculum. There is also a section on vectors and animations and an advanced section. Each area contains 40 tasks arranged in 4 groups of 10. Each task is numbered and uses some form of interactive feedback. The final 10 in each area use elements of geometric construction, which require use of special interactive buttons.Pi Day
http://www.merlot.org/merlot/viewMaterial.htm?id=999301
This is a librarian designed research tool to help people learn about what Pi is and why we should celebrate Pi Day (3.14.15). Includes a video with everything you wanted to know about Pi in 3.14 minutes.Totally Tessellated
http://www.merlot.org/merlot/viewMaterial.htm?id=83040
This site is a comprehensive introduction to tessellations. The basic mathematics underlying tessellations are explained and many examples of tessellations in real life are displayed. M. C. Escher and his well-known tessellations are also covered and animated.Diamond Theory
http://www.merlot.org/merlot/viewMaterial.htm?id=76660
Symmetry properties of the 4x4 array. The invariance of symmetry displayed in the author's Diamond 16 Puzzle (online) suggests insights into finite geometry, group theory, and combinatorics.The Diamond 16 Puzzle
http://www.merlot.org/merlot/viewMaterial.htm?id=76388
In solving this puzzle, you permute rows, columns, and quadrants in a 4x4 array of 2-color tiles to make a variety of symmetric designs. A link to underlying theory is provided.