 ChengPleijel Point of a Quadrangle  Ben Cheng
A Java applet that lets you play with the ChengPleijel point: imagine a point O' at a certain height H above the flat plane containing the quadrangle ABCD and which orthogonally projects down directly to the point O on the plane. By definition, the ChengPleijel
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 Chinese Numbers  Erik E. Peterson
Convert arabic numerals up to 1 billion into Chinese numbers, or show the value of a Chinese number (type or paste in a number in Chinese and click "Show English." With, in addition, A Brief Description of the Chinese Number System, and links to related
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 ChisenBop (or Chisanbop)  Andrew Harris, Computer Science, Indiana & Purdue Universities
An ancient technique from Korea, similar to the abacus or soroban: using your fingers as an analog computer, illustrated and with Real streaming media lessons. Background; simple counting; simple adding and subtracting; adding "around the corner"; subtraction
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 Chron Me! Online Stopwatch
Easily record time in increments, whenever you have a multipart task to time. Press start; press stop; add a label for that segment; repeat as needed; download the resulting comma or semicolonseparated file to your computer, or open it with Excel.
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 Chronological Age Calculator  AGS Publishing
Click the "Age Calculator" button, then enter two calendar dates to compute elapsed years, months, and days. Available for download.
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 CIESEmath Project  Stevens Institute for Technology Center for Improved Engineering and Science Education
Outlines of ten units of Everyday Math and thirteen chapters of Transition Math, some with links to relevant Java applets and Geometer's Sketchpad sketches. The list of activities links to more interactive math tools, instructions, and handouts. A joint
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 Cinderella: Interactive Geometry Software  RichterGebert, Kortenkamp
A fullfeatured interactive geometry program in German that uses Java as the programming language and includes a true symbolic theorem prover. A demo version that will run for 15 minutes at a time may be downloaded from the Web; the site also includes
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 Circle Drawing Experiment  Thomas Denney
Draw a figure on the grid by clicking and dragging. Upon release of the mouse button, this JavaScript calculates a "perfect circle" accuracy score by using the sketch's perimeter as the circumference of a perfect circle, and comparing its area to the
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 Circle Graph  What Percent?  NASA Lewis Learning Technologies Project
This circle graph shows how Jimmy spent his time during the last 24 hours. What percent of time did he spend watching television? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Circle Zap  Michael Bulmer
A Java applet that gathers data on your ability to use a mouse rapidly and accurately, with suggested questions for classroom activities.
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 The Classical & Keynesian ADAS Model of the Canadian Economy  Elmer G. Wiens; Egwald Web Services Ltd.
Macroeconomics model of the Canadian economy considering both the aggregate supply and aggregate demand for products. Illustrated article with interactive supplemental page.
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 Cleave Books
Teacher Resources on Line (TRoL) include downloadable grid paper; Ttiles; dictionary exercises; shapes Bingo; MisMaths, an annotated collection of innumeracy and other math mistakes in news headlines; fact sheets; tables; formulas; a mathematical vocabulary
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 Clickmazes  Gilbert, Mitchell
An extensive collection of interactive puzzles and mazes organized in the following categories: Maze gallery; Attic gallery; Maze of Life; HexaRoll; Oskar's fourbit mazes; 2D tilt mazes; Colourzone mazes; 3D tilt mazes; Tilt puzzles; NEWS and RULES;
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 The CliffHanger (MSTE)  Nicholas Exner; University of Illinois at UrbanaChampaign (UIUC)
A Java simulation of statistics and probability. From where he stands, one step toward the cliff would send poor Homer Simpson over the edge. He takes random steps, either toward or away from the cliff. At any step his probability of taking a step away
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 Clockworks: From Sundials to the Atomic Second  Britannica.com
A site about the development of instruments that have measured time over the centuries. Each instrument has a page featuring a description and an illustrated diagram, and most include a QuickTime animation demonstrating how the mechanism works. Iinstruments
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 The Coffeecup Caustic  Roy Williams
You are drinking from a cylindrical cup in the sunshine. Sometimes, when the sun shines into the cup, you can see a crescent of light as the sunshine reflects from the inside of the cup onto the surface of the drink. This Java applet illustrates the optics
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 Colégio de Gaia, Grupo de Matematica
Math resources in Portuguese: Galeria de Sketches  a gallery of JavaSketchpad and Geometer's Sketchpad problems and sketches including the Pythagorean theorem (o Teorema de Pitágoras), Vector Addition (Adicao de Vectores), cutting a cube/parallelepiped
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 The Collage Theorem  Cut the Knot!, Alexander Bogomolny
To find an IFS whose attractor is "close to" or "looks like" a given set, one must endeavor to find a set of transformations  contraction mappings on a suitable set within which the given set lies  such that the union, or collage, of the images of the
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 Collatz Conjecture Calculation Center  Klaas IJntema
JavaScript tools to investigate the Collatz problem, as well as general mathematics tools and some recreational mathematics. Some programs are freely downloadable.
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 A Collection of Applets  Sione Palu
Java applets for classroom use. Those created so far include: Polynomial Roots; Frequency Distribution; Completing the Square; Polynomial Fitting; Statistical Analysis; Number Works; and Polynomial Differentiation. Read about Palu's background and educational
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 College Algebra Online  University of North Carolina, Wilmington
An introduction to the online version of the College Algebra course offered by Jeff Brown at UNCW. Information on the course content and structure is available here. Guests may view selected lessons from the course, with Java interactive activities, illustrations,
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 CollegeCram.com  The Smartacus Corporation
Feebased service providing tutorials on a number of topics including math, generally at the early college level. Tutorial topics are visible without a subscription.
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 College Entrance Exam Math Prep  EduCAD
A free, interactive library of the most complex math problem types found on the SAT® or ACT® college entrance exams. The "show next step" button provides a hint about the strategy to take; a correct answer submitted with the "check answer" button
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 College Math Prep for High School Students  C. J. Kentler and V. S. Manoranjan, Washington State University
Selfscoring problems, new with every click, to gauge a student's preparedness for college level math: operations, solving for a variable, solving linear equations, word problems, solving absolute value equations, solving inequalities, distance between
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 Combinatorial Games  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A collection of interactive combinatorial games, many implemented in both normal and misère versions, including by Kayles, Nimble, and Northcott; variants of Nim, such as Wythoff's Nim; OnePile and TakeAway games; a subtraction game, a fraction
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 Combustion Chaos  Univ. of Houston, Univ. of Texas at San Antonio
An interdisciplinary research group studying the dynamics of pattern formation in burner stabilized premixed flames. Includes graphics, movies, and Java simulations of different patterns, explanations of models and experiments, and list of related publications;
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 CommonsMath: The Jakarta Mathematics Library  Phil Steitz, The Apache Software Foundation
Commons Math is an open source Java library of lightweight, selfcontained
mathematics and statistics components. Download releases; post to the wiki; read the users guide and project documentation.
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 Complexification  Jared Tarbell
View interactive, open source Java applets of fractals and other mathematically significant graphics.
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 The Complexity of Geometric Constructions  François Labelle
Efficient constructions with straightedge and collapsing compass (the geometric tools of Euclid). The question of what can and cannot be constructed with this model of computation is basically answered by Galois Theory. This document deals with the minimum
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 Complex Numbers  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A series of articles on the algebraic structure of complex numbers and their application to solving various problems in algebra and geometry. Several of the discussed features, for example, real and complex products, are drawn from very recent literature
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 Complex Numbers (Manipula Math)  International Education Software (IES)
Java applets to investigate complex numbers, their reciprocals, powers, and other selected functions. (One function leads to a fractal.)
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 Complex Numbers & Trig  Alan Selby
Complex Numbers and the Distributive Law for Complex Numbers, offering a short way to reach and explain trigonometry, the Pythagorean theorem, trig formulas for dot and crossproducts, the cosine law, and a converse to the Pythagorean theorem. A geometric
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 The Computational Beauty of Nature  Gary William Flake
Computer Explorations of Fractals, Chaos, Complex Systems, and Adaptation: a companion site for a book by Gary William Flake, "affectionately known as 'The Fish and Chips Book'." Contains applets and source code.
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 Computational Geometry Student Projects, 1997  Godfried Toussaint, McGill University
A variety of student projects: papers presented on the Web, many with Java applets, and available in postscript form. Topics include: Quadrangulations of Planar Sets of Points; The Jordan Curve Theorem for Polygons; The Art Gallery Problem; Ear Cutting;
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 Computer Animated Statistics  Adriano Garsia, University of California, San Diego
Java applets for probabilistic studies of picking fortunes from a limited supply of fortune cookies, picking prizes from an unlimited supply of cereal boxes, and Breaking the Bank (roulette). Also, Let's Make a Deal, an interactive solution to the Monty
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 Compvter Romanvs (Natural Math)  Edward R. Hobbs
A Roman numeral calculator. "Caesar has proclaimed Compvter Romanvs to be the official calcvlator of the Roman Empire. Yov now have at yovr disposal the latest in high technology to assist in all manner of nvmerical problems. Yes, whether yov're bvilding
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 Concentric Geometric Hierarchies  Kirby Urner, 4D Solutions
Exhibit 1 is a JavaScript demo exhibit of the concentric hierarchy from the tetrahedron out to the rhombic dodecahedron. The shapes are all 2.3.4fold symmetric. A status bar shows the volumes of the shapes when you select an isolated view. A cumulative
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 Conics (Manipula Math)  International Education Software (IES)
Java applets to investigate the conic sections, including different ways to draw them, their reflective properties, and the shapes traced by shadows at different latitudes.
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 Coniques interactives en CabriJava (Interactive conics with CabriJava)  Yves Martin
Conics in the Euclidean and projective planes; also in algebra (group),
bilinear geometry, and arithmetic (PellFermat): 123 interactive files
using the CabriJava technology. The site is in French.
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 Connect 4  Keith Pomakis
Play it on the Web, specifying your own parameters. The site includes the rules of the game.
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 Connexions  Rice University
Connexions is a nonprofit startup launched at Rice University in 1999 that aims to reinvent how we write, edit, publish, and use textbooks and other learning materials. It is a global repository of educational content that can be described in four words
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 Constant Perimeter and Constant Area Rectangles (Connected Geometry)  Daniel Scher; Education Development Center, Inc. (EDC)
Interactive Java animations accompany the article "Theorems in Motion: Using Dynamic Geometry to Gain Fresh Insights" by Daniel Scher in the April 1996 issue of the Mathematics Teacher. The article outlines how dynamic geometry software can be used to
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 Constructor  Soda
Constructor animates and edits twodimensional models made out of masses and springs. The springs can be controlled by a wave to make pulsing muscles, and you can construct models that bounce, roll, walk, etc. Try some of the readymade models or build
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 Conteúdos Digitais em Matemática para o Ensino Médio  Kaleff, Ana Maria; and Humberto José Bortolossi  Universidade Federal Fluminense
Educational Java applets and lesson plans in Portuguese. Topics include real functions, algebra, permutations, polygons, tangrams, conic sections, solids of revolution, and other two and threedimensional geometry, which includes the Englishlanguage
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 Convergence  Mathematical Association of America (MAA)
An online magazine encouraging the use of mathematics history as a learning and teaching tool. Convergence will include: math history articles that have a special pedagogical or learning appeal; sharing of classroom experiences; animated mathematical
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 Conversion Program  Lawrence Goetz
A page that uses JavaScript to convert temperature between Fahrenheit and Celsius, length among inches, centimeters, feet, yards, meters, miles, and kilometers; weight among grams, ounces, pounds, and kilograms; and volume among fluid ounces, cups, pints,
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 ConvertAuto.com  Lilly Hammond
JavaScript calclulators for instant online conversions: angles; area; cooking, such as teaspoons (tsp) and quarts (qts); foreign currencies; density; energy; force; frequency; fuel economy, such as miles per gallon (mpg); length; power; pressure; speed;
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 The Converter Site  Alastair Hazell
A user friendly metric and imperial converter tool. Converts length, area,
weight, speed, temperature, time, energy, force, length, mass, power and
currency.
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 Converting Inches to Miles  NASA Lewis Learning Technologies Project
The scale on a road map is 1 inch = 250 miles, how many inches would represent 1250 miles? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Converting Tons to Pounds  NASA Lewis Learning Technologies Project
A loaded moving van weighs 5 tons. How many pounds would 10 loaded moving vans weigh? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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