 Concurrent Triangles  Jim Wilson
Sketches and scripts exploring various concurrencies in triangles.
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 Condorcet.org  Blake Cretney
Theories on voting and social choice. Learn about an electoral method called "ranked pairs" and download software to tabulate other voting methods. The Election Methods Resource enumerates "single winner" and legislative approaches to running elections.
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 Cone, Cylinder Edges?  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about whether cones or cylinders have edges, such as "Does a cone have an edge? A vertex?"
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 Cone Formulas (Ask Dr. Math FAQ)  Math Forum
Formulas for finding the height, surface area, and volume of a cone, right circular cone, or frustum of a cone.
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 Cone Layout  Jock Dempsey, Dempsey's Forge
A flat layout showing that the ratio or percentage of the layout circle is also the sine of half the angle of the top of the cone. If you want a cone with a 90degree point, the ratio is the sine of half the angle of the point.
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 Conference Board of Mathematical Sciences (CBMS)
The Conference Board of the Mathematical Sciences is an umbrella organization consisting of sixteen professional societies all of which have as one of their primary objectives the increase or diffusion of knowledge in one or more of the mathematical sciences.
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 Conferences on the Teaching of Mathematics (CTM) (Mathematics Archives)  Husch, et al., Editors
Currently includes presentations and contributed papers from the Fifth Conference on the Teaching of Mathematics held on June 2122, 1996 in Baltimore, MD and the Sixth Conference on the Teaching of Mathematics held on June 2021, 1997 in Milwaukee, WI.
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 Confessions of an Engineering Washout  Douglas Kern
Article about the author's experiences with undergraduate education for engineering.
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 Conformal Maps of Nonsmooth Surfaces and Their Applications  Vladimir M. Miklyukov
"In contrast with classic mathematical analysis that relies on ancient magical rites and overidealized relations, mathematical problems arising from the theory of micro and nanoflows require more real logical constructions such as investigations of functions
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 Confronting Technology  Lowell Monke
This site provides a variety of resources critically examining the relationship between human beings and technology, with specific resources on the way computers are used in education. They include: an annotated bibliography, a list of documents available
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 Congruence Of Triangles  Jim Loy
A short introduction to equivalent side/angle theorems and congruence postulates in triangles.
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 Congruence Of Triangles, Part II  Jim Loy
This article proves that the three "theorems" or "postulates" that are the basis of Euclid's theories about triangle congruence are actually equivalent.
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 The Conic Sections in Polar Coordinates  David Arnold; Mathematics Dept., College of the Redwoods, CA
An interactive study of the polar form of the equation for a conic section, for readers familiar with polar coordinates and triangle trigonometry. This activity is also a vehicle for the introduction of the Geometer's Sketchpad, though no prior experience
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 Conic Sections (Visual Dictionary of Special Plane Curves)  Xah Lee
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
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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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 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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 Connect Capture Game  Rick Nordal
This paper and pencil game combines chess with dotsandboxes. Completing a box "activates" the enclosed chess piece, which may then capture other activated chess pieces for points.
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 Connected Curriculum Project: CCP Materials  Lawrence C. Moore & David A. Smith, Duke University
Materials for Precalculus, Differential Calculus, Integral Calculus, Multivariable Calculus, Differential Equations, Linear Algebra, and Engineering Math, with application areas in biology, chemistry, economics, engineering, environmental sciences, epidemiology,
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 Connected Curriculum Project (CCP)  Moore, Smith; Duke University
The Duke component of a coordinated effort to create interactive learning environments for a wide range of mathematics and mathematically based applications, combining the flexibility and connectivity of the Web with the power of computer algebra systems.
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 Connected Curriculum Project: Multivariable Calculus, Linear Algebra, and Differential Equations  Frank Wattenberg, Department of Mathematics, Montana State University
Materials (TI92, Maple, Mathematica 2, Mathematica 3, MathCad) organized around the interplay between mathematics and its applications, written together with the textbook Multivariable Calculus, Linear Algebra, and Differential Equations in a Real and
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 Connected Mathematics Project (CMP)  Michigan State University
A project funded by the NSF to develop a complete mathematics curriculum for the middle grades (68), one rich in connections among the various topic strands of the subject, between mathematics and its applications in other disciplines, between the planned
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 Connected Mathematics Project Sketchpad Activities  Nathalie Sinclair, Michigan State University
Worksheets, sketches, and teacher notes for the Connected Mathematics Project curriculum (CMP). Developed by researchers from Michigan State University and KCP Technologies, who have surveyed Years 6 and 7 of CMP. Use the link at the bottom of the page
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 CONNECT: Everyone can do Math and Science  Colorado
Colorado's NSFfunded statewide systemic initiative in mathematics and science. CONNECT is charged to provide support and leadership to increase the achievement of all Colorado students in mathematics and science, kindergarten through baccalaureate (K16).
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 Connecting Geometry  Cathleen V. Sanders
A fully credited high school distance learning geometry course offered via the Internet to students throughout the Hawaiian islands as part of a grantfunded pilot project through the Hawaii Department of Education. During this ESchool (electronic school)
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 Connecting Mathematics  a Maths Thesaurus  University of Cambridge, U.K.
More than an alphabetical list of words and their definitions, this site has grown from a proposal made by the NRICH project at the University of Cambridge, to develop an online dictionary of mathematics to support its other online publications. The thesaurus
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 Connecting Mathematics to Our Lives  De Orilla a Orilla
Through bilingual discussions online, sister class partnerships, global data gathering, and other classroom collaborations at a distance, students explore how math is used in their families and communities; use math skills to investigate community or
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 Connect with Music  Finn, Rudolph, O'Malley, Frankel, Ordway, and Langol
Thirty free interdisciplinary lesson plans that use multimedia, music, and technology to aid in the instruction of Language Arts, Mathematics, and Science at the middle school level. Lesson plans include comprehensive scoring rubrics, links to standards
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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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 ConquerMaths  Generic Maths, Ltd.
Fully online mathematics teaching system. 482 lessons with worksheets and
tests for ages 11 to 16. Money back guarantee offered. Also available from MathsOnlineTutor.com.
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 Consortium for Mathematics and Its Applications (COMAP)
A nonprofit organization offering multidisciplinary and academically rigorous curriculum materials and teacher development programs based on mathematical exploration of realworld problems. Developers of the PBS television series "For All Practical Purposes:
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 Consortium for School Networking (CoSN)  Information Institute of Syracuse
A community of organizations, government agencies, corporations, and individuals in important leadership roles formed to further the development and use of telecommunications in K12 education. Topics include legislative issues, conference participants
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 Consortium to Develop an Intelligent Mathematical Programming System (IMPS)  Harvey Greenberg; Dept. of Mathematics, Univ. of Colorado at Denver
Advances in computing technology have created a situation where we can solve larger problems than we can understand. This is true for most linear programs, and it is becoming increasingly true for nonlinear and integer forms. In addition, model management
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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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 The Constants and Equations Pages  Jonathan Stott
A growing reference resource providing alphabetically listed categories of some of the more important and useful aspects of maths and special sections on numbers, algebra, trigonometry, integration, differentiation, and SI units and symbols, with in addition
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 Constants, Units, and Uncertainty  National Institute of Standards and Technology (NIST)
A reference with three sections: Fundamental Physical Constants (values of the constants and related information, and a searchable bibliography on the constants); the International System of Units (indepth information on the SI, the modern metric system),
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 Constrained and Unconstrained Testing Environment (CUTE)  DCI (UK)
A suite of Fortran subroutines, scripts, and test problems for linear and nonlinear optimization. Its purpose is to provide ways to explore an extensive collection of problems (over 800 different test problems to date), to compare existing packages and
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 Constraints  Davide Cucciniello
This SATbased propositional (Boolean) logic engine for the iPhone lets you add, modify, delete, enable or disable constraints; assign values (true, false) to Boolean variables; and find all possible assignments to unassigned Boolean variables as solutions
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 Constructing Math Instruction  Chris Robinson
Blog by teacher "averse to binary thinking that refuses to countenance all the complexities of the minefield that is the real classroom." Posts, which date back to December, 2012, have included "Number Sense and My Students"; "Analyzing Student Questions";
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 Constructing SemiRegular Tilings  Kevin Mitchell
A document based on a talk given at the Spring 1995 Meeting of the Seaway Section of the Mathematical Association of America. Contents include: Introduction and Historical Background; Notation and Definitions; General Theorems; Hyperbolic Results; and
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 Constructions with ruler and compass
 Zef Damen
A page that answers the question, What are rulerandcompass constructions? With links to stepbystep drawings for constructions: bisecting a given angle; constructing: a line perpendicular to a given line that divides it into two equal parts; a line
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 Constructivism and Education: A Shopper's Guide  Moses A. Boudourides
A brief review of the various streams of constructivism in studies of education, society, science and technology: philosophical, cybernetic, educational, and sociological. A paper presented at the International Conference on the Teaching of Mathematics
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 Constructivism and Mathematical Concepts  Pathways to School Improvement
A discussion of constructivism as it relates to teaching mathematics. A list of reflective questions for teachers and references is included.
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 Constructivism and the Five E's: The pH Factor  Miami Museum of Science
Constructivism is a philosophy about learning which proposes that learners need to build their own understanding of new ideas. To introduce the pH factor to students in a constructivist way, the Miami Museum of Science adapted their "Seven Es" (Excite,
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 Constructivism  Classroom Compass
The winter 1994 issue of Classroom Compass explores this theory of learning, including a brief literature summary and suggestions for the constructivist classroom. Two instructional activities (Which Container Holds the Most? for younger children and
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 Constructivism in mathematics education  what does it mean?  John and Annie Selden; The Math Forum
A presentation given at the Joint AMS/MAA Mathematics Meetings, January 1996, Orlando, Florida. Includes an annotated bibliography: Kinds of Constructivism.
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 Constructivism in Science and Mathematics Education  Michael R. Matthews
Matthews discusses constructivism, its scope and influence, and looks at the particular case of New Zealand, in this article from the 99th Yearbook of the National Society for the Study of Education.
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 Constructivism in the Classroom  Mathematics Education at the Math Forum
The Math Forum's suggested sites on constructivism in math education, including projects and Web resources (conference sessions, articles, reports). See also our page of selected Internet sites with a constructivist orientation or that offer readings
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 Constructivism: Vygotsky and the Internet  Mathematics Education at The Math Forum
The ideas of Lev Semenovich Vygotsky have sparked considerable thought on the topic of constructivism. The Math Forum has collected a list of links to sites, projects, and articles about Vygotsky, constructivism, and the Internet, including comparisons
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 Constructivist Mathematics and Unicorns  Lee V. Stiff
The thenpresident of NCTM lays out distinctions among various forms of constructivism, and how they relate to the Principles and Standards, in this 2001 article.
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 A Constructivist View of Science Education  University of Massachusetts Physics Education Research Group (UMPERG)
Four premises of constructivism: knowledge is constructed, not transmitted; prior knowledge impacts the learning process; initial understanding is local, not global; and building useful knowledge structures requires effortful and purposeful activity;
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