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GEM Subject is
Mathematics -- Instructional issues
791 - 795
Interactivate, Shodor's "set of free, online courseware for exploration in science and mathematics" presents this activity to teach students the geometry concept of tessellation. The java-based activity allows students...
PBS presents this game in which students are asked to rearrange and rotate a set of geometric shapes to form the image of a rabbit, candle, fox, and others. Tangram "is an ancient game that originated in China" and it...
Wallpaper Groups: The Discontinuous Groups of Rotation and Translation in the Plane
An undergraduate tutorial on wallpaper groups, with illustrations of the 17 wallpapers groups and a wallpaper gallery. Technically, the derivation of all discontinuous groups of rotation and translation in the plane....
An Introduction to Projective Geometry
The contents of this paper include: The Projective Plane; Projective Space; Projective Geometry Applied to Computer Vision; Demonstration of Cross Ratio in P^1; and a bibliography. (Euclidean geometry is a subset of...
Proportionality in Similar Triangles: A Cross-Cultural Comparison
In the introduction to this site we learn that, "A fundamental result of geometry, used often in secondary and collegiate mathematics, is the equality of ratios of corresponding sides in similar triangles." Accordingly...
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