 Surface Distance Between Two Points of Latitude and Longitude  John A. Byers, United States Department of Agriculture  Agricultural Research Service
Enter the latitude and longitude of two points on Earth, and this JavaScript program returns the distance between the locations in kilometers, miles, and nautical miles. Similarly, calculate the great circle distances between over 300 cities. Download
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 Surface Plotter  Yanto Suryono
A Java applet that plots surfaces defined by explicit twovariable mathematical functions (i.e: z = f(x,y)). Surfaces thus plotted may be rotated in any direction.
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 Surfaces Beyond the Third Dimension  Thomas Banchoff
A site that documents an art exhibit hosted by the Providence, Rhode Island Art Club in 1996, featuring computergenerated artwork designed by Tom Banchoff in collaboration with Davide Cervone (now at Union College) and student associates at Brown University.
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 Surfaces (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
A surface, or 2manifold, is a shape any small enough neighborhood of which is topologically equivalent to a neighborhood of a point in the plane. For instance, a the surface of a cube is a surface topologically equivalent to the surface of a sphere.
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 Surfin' Sinefeld: Flash Animations for Precalculus, Calculus and Statistics  Ralph Irons
Animated graphing calculators for exponential, logarithmic, sinusoidal and
power functions and their derivatives; animated histogram for 5 data sets;
quizzes; Derivative Pong.
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 SURFSTAT australia  Keith Dear; National Centre for Epidemiology and Population Health, The Australian National University
An online text in introductory Statistics from the University of Newcastle. Contents: Summarizing and Presenting Data (Types of Variate; Presenting Discrete and Continuous Data; Charactistics of a Distribution; Measures of Central Tendency and Variability;
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 Surreal Films  Ivars Peterson  Science News Online
Mathematicians have worked out a geometrically optimal transformation that minimizes the energy required to exchange a sphere's inside and outside surfaces. See Selected Images from The Optiverse, a video by John Sullivan, George Francis, and Stuart
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 Survey of the Classes of 1997 Concerning Their High School Math Programs and How Well These Programs Prepared Them for College Math  Gregory F. Bachelis
A Bloomfield Hills School District (BHSD; Oakland County, Michigan) survey comparing the college performances of high school students with differing high school math programs, particularly in response to the the advent of the CorePlus Mathematics Project
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 A Survey of Venn Diagrams  Frank Ruskey; Dept. of Computer Science, Univ. of Victoria, B.C., Canada
Facts and figures about Venn diagrams, particularly as they relate to combinatorial properties of the diagrams: Who was John Venn? What is a Venn diagram? Formal definition of Venn diagrams; General constructions of Venn diagrams. Also Graphs associated
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 Suspension Rates at U.S. Schools  Regents of the University of California
Bar graphs of suspension rates at the nation's schools, based on data from the U.S. Department of Education's Office for Civil Rights Data Collection. Select grades, state, and district(s) to see public school disciplinary information according to race,
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 sxpmaths  Stuart Price
Blog, subtitled "education, maths, procrastination," by an Alevel Maths and Further Maths teacher in southern England "always exploring ideas." Posts, which date back to August, 2013, have included "AS Maths and Mathematical Thinking"; "Reading, Reliability
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 Sybilla Beckmann Kazez
Biography, books, projects, papers, and presentations of the Josiah Meigs Distinguished Teaching Professor of Mathematics at the University of Georgia (UGA). Originally researching arithmetic geometry, Beckmann now considers the mathematical education
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 SyllabusWeb  Syllabus Press, Inc.
From the publishers of Syllabus Magazine, a technology magazine for high schools, colleges, and universities. Highlights of recent issues of the magazine and full text archives of all Press publications. The June 1995 issue covers telecommunications and
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 Syllogism 1.0  Ben Sharvy
Software to download. Enter a syllogism of any length. The program will tell you whether it is a valid syllogism, and if not, why not. It will also analyse the links between terms in the syllogism. BASIC code, and a version compiled for the Mac.
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 The Syllogistic Machine  Johan Mårtensson
A JavaScript machine for checking the properties of Aristotelian syllogisms, with links to Mårtensson's OnLine Logic Book.
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 Sylvan Learning Center
Math help and tutoring, tailored to meet academic goals and needs. Sylvan's teachers create custom learning plans based on assessment, with ongoing evaluations and program updates to continue challenging students. Search by geography to find a center
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 Symbolab  EqsQuest
This semantic search engine for math and science considers the contextual meaning of equations and expressions. Query a mix of text and symbols with Symbolab's pad, which toggles among Greek letters, operators, differentials, and "accents" (vectors, hats,
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 SymmeToy  Hank Hufnagel
A Windows program for creating paint patterns, symmetry roses, tessellated art, and symmetrically decorated 3D polyhedron models. The program is easy to learn, fun to use and includes extensive online help. Appropriate for all ages, but especially for
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 Symmetric Patterns at the Alhambra, with Math Problems  Susan Addington, David Marshall
The Alhambra is a walled city and fortress in Granada, Spain, built during the last Islamic sultanate on the Iberian peninsula, the Nasrid Dynasty (12381492). The palace is lavishly decorated with stone and wood carvings and tile patterns on most of
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 Symmetrier, monstre & tesselationer med The Geometer's Sketchpad  Allan Bergmann Jensen, Kalundborg, Denmark
GSP Symmetries, Patterns and Tessellations. Contains a gallery of wallpaper designs constructed using the Geometer's Sketchpad with JavaSketchpad versions to explore, an illustrated paper on "The Math About Symmetries" (in Danish), a GSP guide, a links
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 Symmetries and the Millennium (Math Chat)  Frank Morgan; Christian Science Monitor
What are the symmetries of a cube in space? What about a hypercube in 4 dimensional space?
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 Symmetry and Group Theory (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
Computational and recreational geometry pointers to sites with information, problems, and lessons having to do with symmetry and group theory (tessellations, kaleidoscopes, origami, etc.).
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 Symmetry and Orbifolds (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Given a symmetric pattern, what happens when you identify equivalent points? You get an object with interesting topological and geometrical properties, called an orbifold... hearts, paper dolls, wave patterns, quotient orbifolds, Moebius bands.
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 Symmetry and Pattern: The Art of Oriental Carpets  The Textile Museum/Math Forum
In this online exhibit, the study of symmetry is used to analyze patterns in Oriental carpets. A joint project of The Textile Museum and The Math Forum.
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 Symmetry  Rick Engel
A lesson on the symmetry of the Platonic and Archimedean solids using Polymorf, a math manipulative product. Demonstrates inscription, truncation, sectioning, and space filling with polyhedra.
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 Symmetry Studio 1.01  Binkley, Simon; Artware, Inc.
Symmetry software for mathematics and art, for the Macintosh. A computeraided design tool that allows you to quickly create complex twodimensional symmetrical patterns. It simplifies the study and use of mathematical principles that underlie the regular
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 SysQuake  Calerga
Highly interactive software for the design and simulation of dynamic systems. Runs on PowerPC Macintosh computers and Windows 95, 98 and NT 4 computers. SysQuake LE is the free version of SysQuake, and may be downloaded from the site.
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 SysteMATHics  Sigurd Andersen
Based on a discipline started by John G. Bennett, systematics is an attempt to understand the meaning implicit in number. The three areas of mathematical exploration covered are triadic numbers; ngrams, number patterns expressed graphically using the
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 System Dynamics in Education Project (SDEP)
System dynamics is a method for studying the world around us. It deals with understanding how complex systems change over time. Internal feedback loops within the structure of the system influence the entire system behavior. Math materials are available
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 System Dynamics  Maryland Virtual High School at Montgomery Blair High School
Understanding how complex systems change over time: internal feedback loops within the structure of the system influence the entire system behavior. Tools and resources including connections to other system dynamics/operations research projects; and links
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 Systemic Initiative for Montana Mathematics and Science (SIMMS)
A fiveyear, cooperative initiative of the state of Montana and the National
Science Foundation, with nine major objectives, including the redesign of the
912 mathematics curriculum using an integrated, interdisciplinary approach for all students,
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 syzygymatrix: solutions for small problems in the classroom  Jeff LeMieux
Generate cryptograms, division worksheets, fraction worksheets, and proportion problems. Select the length of dividend, denominators specified by the Washington State Standards for Grade 7, number of problems, and more. The worksheet maker prints solutions.
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 Syzygy Shareware  Thomas C. Bretl
Freeware to "explore, see in new ways, discover patterns, and solve problems." Bretl offers simulations and visualizations for investigating probability, calculus, Mandelbrot Sets, and Sierpinski's Triangle and similar fractals by recursion; GeoFit (create
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 T^{3} Conferences  Texas Instruments, Inc.
The Tł program hosts the annual Tł International Conference each spring and twoday Regional Conferences throughout the year. Tł Virtual Conferences contain video recorded sessions from Tł events. Tł conferences are appropriate for Kcollege, mathematics
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 Table of numbers problem  Dario Alpern
Place the natural numbers between 1 and mn in a table of m rows by n columns, so that the sum of the addition of the products of the numbers that compose the rows plus the addition of the products of the numbers that compose the columns is as low as possible.
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 Tables of Roman Measurement  Mike Neill
Tables of Roman measurement on this site (Calender, Capacity, Length, Money, Surface, Weight) are taken from A Smaller LatinEnglish Dictionary, by William Smith LLD, a Classical Examiner in the University of London, John Murray, Albemarle Street, 1865.
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 TagMath  Cody Taggart
Blog by a Wisconsinite now teaching at the United Nations International School in Hanoi (Vietnam). Weekly updates, 48hour challenges, and other posts addressed to Taggart's students date back to February, 2012; and have included "Dublox," "Reviewing
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 Take a Little Piece of PI with You Wherever You Go  Adam Zampino
Proudly display PI to 1000 decimal places in an attractive design, in various types of apparel and housewares (mugs, clocks, etc.). PI has fascinated people for centuries, and now you can have your own piece of PI to enjoy. This makes a great gift for
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 Taking 20 Percent Off  NASA Lewis Learning Technologies Project
If a $900 computer is on sale for 20 percent off, what is the sale price? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Taking America's Measure  National Institute of Standards and Technology (NIST)
Resources on this site for children include: Metric Pyramid (a pattern that can be printed, cut out, folded, and taped in the shape of a pyramid); Metric Fast Facts for Sports; Metric in the Kitchen; All You Will Need to Know About Metric; Metric Conversion
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 Taking a Workshop or Course  Annenberg Media
Workshops and courses appropriate for preservice and inservice teachers, administrators, reformers, and policymakers. Supplemental video programs called teaching practices libraries are also availablethey give a "flyonthewall" view of real teachers
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 Taking Games Seriously  Cut the Knot!, Alexander Bogomolny
In the twenty years since it first appeared, Winning Ways for Your Mathematical Plays had become a classic and a rarity. So did its companion book, On Numbers And Games, which was written in just about a week by one of the WW's authors and saw the light
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 Talking Math Ed with the Males  Josh and Lorraine Males
This blog "dedicated to all things math ed" includes lesson ideas, policies, curriculum, and research. Posts "for people to have a conversation about mathematics education," which date back to August, 2011, have included "CCSS from the Curriculum Writers
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 Talk of the Nation, Science Friday  Ira Flatow, National Public Radio
An edited version of a radio program that aired on September 9, 1994. Science Friday host, Ira Flatow, interviewed guests Keith Devlin, Dean of Science at St. Mary's College, and William Dunham, math professor at Muhlenberg College.
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 Tangencies of Circles and of Spheres: Radii Solutions  Eugene F. Dearing; Dearing Aviation
New methods of finding the radii of circles tangent to three given circles, (Apollonius' Problem), and the radii of spheres tangent to four given spheres, (Apollonius' Problem in three dimensions). Download the article in zipped format, or view it online.
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 Tangent Circles  Paul Kunkel
Three circles are given. How many circles can be constructed tangent to all three? How are they constructed? This lesson includes ten applets, to cover all of the special cases. Some of them are very complex.
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 Tangoes  Rex Games, Inc.
Based on the ancient Chinese Tangram puzzle, Tangoes is a learning tool that combines artistic and mathematical elements to enhance visual perception ability, develop problem solving skills, and encourage creative thinking capacity and teamwork. Tangoes
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 Tangram Page  S. T. Han
All about tangrams, an ancient Oriental toy that has 7 pieces: 5 triangles in different sizes, 1 square, and 1 parallelogram. The object of the game is to form a given shape using all 7 pieces. Introduction, Puzzle of the Month, PC/Mac Software, Articles
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 Tangrams  J. L. Read; Enchanted Mind
A tangram applet that allows you to rearrange the seven forms to exactly reproduce the given image. To move the pieces, drag them with the mouse. To rotate pieces, click with the right mouse button or (on the Mac with a onebutton mouse) click while holding
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 TaniyamaShimura Conjecture Proved (Math Chat)  Frank Morgan, MAA Online
A proof of the full TaniyamaShimura conjecture, partly included in Wiles's 1994 proof of Fermat's Last Theorem, was announced last week [June, 1999] at a conference in Park City, Utah, by Christophe Breuil, Brian Conrad, Fred Diamond, and Richard Taylor,
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