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1. Chinese Match Puzzles

GeoGebra is a good environment to play Chinese math puzzles. The 8 puzzles in the first series are related to triangles and diamonds (rhombi). The second series is about squares and rectangles.

Drag the matchstick to translate a match, and drag its red head to rotate it about the other end.

http://www.geogebratube.org/material/show/id/990 (Download GeoGebra file)
http://www.geogebratube.org/material/show/id/991 (Download GeoGebra file)