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 Virtual Polyhedra A growing collection of over 1000 virtual reality polyhedra to explore, complementing Hart's Pavilion of Polyhedreality. Includes instructions for building paper models of polyhedra including modular origami, with ideas for classroom use. Each of the sections contains background information and exercises, a list of virtual reality models, and links to further topics. Platonic Solids (Regular... http://www.georgehart.com/virtual-polyhedra/vp.html
 The Many Ways to Construct a Triangle In general, a triangle is defined by its three elements. SAS, ASA, and SSS provide three well-known examples but there are many more. Bogomolny provides a table of constructions (linked to constructions) and invites reader contributions. http://www.cut-the-knot.org/triangle/index.shtml
 Triangle Centers A listing, with description and illustration, of 20th-century triangle centers (including: Schiffler Point, Exeter Point, Parry Point, congruent isoscelizers point, Yff Center of Congruence, isoperimetric point and equal detour point, Ajima-Malfatti Points, Apollonius Point, Morley Centers, Hofstadter Points, and equal parallelians points) and some classical triangle centers (including: centroid,... http://faculty.evansville.edu/ck6/tcenters/index.html
 Encyclopedia of Triangle Centers A searchable catalogue of hundreds of special triangle points (centroid, incenter, Hofstadter points, Yff centers, Apollonius point, etc.), with a glossary, collinearities, graphics, and links to biographical sketches of geometers, geometry software and sites, and more. For pictures and constructions of selected cases, see Triangle Centers. http://faculty.evansville.edu/ck6/encyclopedia/
 Frequently Asked Questions About Trigonometry This is an interactive site that explains the ideas behind trigonometry. It also offers hands on experience in working with triangles. http://catcode.com/trig/
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