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 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/
 Conic Sections (Visual Dictionary of Special Plane Curves) A discussion of the history of conic sections, one of the oldest math subjects studied systematically and thoroughly, with a description, formulas, properties, a proof, Mathematica notebooks, the ellipse seen as a circle, second degree curves, intersection of circles, orthogonal conics, Pascal's Theorem and Brianchon's Theorem, and related sites. Illustrations, including one showing the... http://xahlee.info/SpecialPlaneCurves_dir/ConicSections_dir/...
 Occurrence of the Conics Real-world examples of occurrences of conic sections: ellipses, parabolas, and hyperbolas. http://britton.disted.camosun.bc.ca/jbconics.htm
 Linear Systems of Conics Graphics (with animations) and formulas for systems of curves defined by linear combinations of quadratic equations. http://users.ipfw.edu/CoffmanA/pov/lsoc.html
 Mark's Maths and Excel Pages Geometry topics presented with the aid of downloadable Geometer's Sketchpad (GSP) files; see, in particular, Japanese temple geometry. Two comprehensive Tutorials in Excel spreadsheet form are provided for intermediate and advanced (VBA) users, and an Excel Teachers' markbook is available for... http://www.mfdabbs.pwp.blueyonder.co.uk/
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