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Plane Geometry Web Pages

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Visit this site: http://bigbox.unl.edu/plane/open.htm
Author:David Jaffe
Description: Materials from a geometry course originally taught to future middle and high school teachers. Using definitions, theorems, proofs, and examples, the site introduces mappings; isometries and similarities; angles and trigonometry; congruence and similarity; polygons, their angles, and their areas; barycentric coordinates; and cyclic polygons. Also, advice for writing proofs; a tutorial on Geometer's Sketchpad; the education of Abraham Lincoln (how he came to learn geometry); an exercise on sets; formulas for basic transformations; getting math onto the web; different notions of what the center of a triangle is; and an introduction to Euclidean constructions which discusses legal moves, relaxation, the straightedge and compass as tools, problems of antiquity, and "What Descartes Knew" about constructible numbers.
Levels: Middle School (6-8), High School (9-12), College
Languages: English
Resource Types: Course Notes, Problems/Puzzles, Tutorials, Geometer's Sketchpad
Math Topics: Euclidean Plane Geometry, Conic Sections and Circles, Constructions, Triangles and Other Polygons

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