 Archimedes' Square (Stomachion)  Kadon Enterprises, Inc.
Square puzzle dissected into 14 tiles, described in Archimedes' palimpsest. Oldest documented puzzle in history, from ca. 250 B.C. Now known to have 536 distinct solutions.
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 Archimy.com: 3D Graphs Online  Denis Kozyr
A service for drawing the graphs of all kinds of functions. Users can define a graph by specifying the formula for the coordinates x, y, and z.
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 Archives Henri Poincaré  PierreEdouard Bour and Manuel Rebuschi
La laboratoire de Philosophie et d'Histoire des Sciences (LPHS) réunit des scientifiques intéressés à l'histoire et à l'épistémologie de leur disciplines et des philosophes et historiens prêts à
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 Archives of American Mathematics  The Dolph Briscoe Center for American History, The University of Texas at Austin
The only archival repository in the United States solely dedicated to collecting, preserving, and providing access to the records of American mathematicians and mathematical organizations for use by historians, mathematicians, educators, and others interested
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 ArcLessons  Environmental Systems Research Institute, Inc. (ESRI)
Lessons for using geographic information systems (GIS) in the classroom include X and Y Coordinates Rule the Map, Investigating Temperature Extremes in the USA, Baseball Radio Station Analysis, The Dust Bowl, The Great Migration, Japanese American Internment,
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 Arctangent Formulas for Pi  Roy Williams
What is a reasonable way to compute Pi? Methods that have been chosen for many of the groundbreaking digitstorms in the past have been based on arctangent formulae.
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 Area and Diameter  NASA Lewis Learning Technologies Project
Mrs. Bosley wants a big round piece of plastic to throw over her little boy's round sandbox to keep the sand clean. The sandbox has a diameter of 3 meters. Approximately how big will the round piece of plastic need to be? A detailed answer is provided.
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 Area and perimeter  Mark Motyka, Math League Multimedia
Definitions and illustrations: Area; Area of a square; Area of a rectangle; Area of a parallelogram; Area of a trapezoid; Area of a triangle; Area of a circle; Perimeter; Circumference of a circle.
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 Area Under Curves: The Integral  Don Cohen (The Mathman)
Area on the geoboard; Plotting points on a computer or programmable calculator to find the area under curves; Finding the area under curves on graph paper. Sample problems with some answers and a program to plot points  from Chapter 13 of Don Cohen's
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 Are Mathematicians Turning Soft?  Keith Devlin (Devlin's Angle)
An article about 'soft mathematics'. "...In order to capture some of the abstract patterns and structures of mind and language, linguists sometimes find it convenient (perhaps necessary) to make use of mathematics, or at least mathematical notation or
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 Argus Clearinghouse: Math and Statistics  Argus Associates, Inc.
Guides on topics pertaining to the study of numbers, measurement, and physical or virtual space.
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 Arithmagic  Ivars Peterson (MathTrek)
Arthur T. Benjamin eschews the usual trappings of the magician's trade. Calling himself a mathemagician, he astonishes audiences with amazing feats of mental arithmetic. Behind the scenes, he reveals how you, too, can look like a genius without really
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 Arithmagic (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
Prof. Arthur Benjamin amazes audiences by multiplying numbers in his head faster than someone using a calculator. Benjamin says that anyone  young or old  can learn to do the same feats of mental arithmetic. All it takes is a memory for numbers and
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 Arithmetic and Algebra  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
More than 110 games or puzzles having to do with arithmetic or algebra, with extensive discussions and solutions. Most require a browser capable of displaying JavaScript or Java.
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 Arithmetic and Algebra Review Problems  Alan Selby
Arithmetic and algebra review problems to help people check or diagnose arithmetic skills and other calculation or algebra skills. Includes a 20x20 times table.
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 Arithmetic (Funk & Wagnalls Multimedia Encyclopedia)  Lycos Zone: Mathematics
A short article on arithmetic: fundamental definitions and laws; theory of divisors; fractions; and decimals.
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 Arizona Mathematical Software
A collection of approximately 60 educational programs that are designed for use by instructors and students in classroom, laboratory, and home environments. Software falls into four categories: Are You Ready?; Slide Shows; Teacher Aids; Toolkits. It runs
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 The Arlington Algebra Project  Arlington Central School District
Exercises and homework, organized into twelve units, written by 25 Arlington math teachers from the LaGrangeville (NY) high school and middle schools.
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 Around the Dartboard  Ivars Peterson (MathLand)
The numbers on a standard dartboard have the following order, going clockwise starting at the top: 20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7, 16, 8, 11, 14, 9, 15, and 5. Why this particular order? A possible criterion for designing a dartboard is
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 Art and Mathematics  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about art and mathematics, such as "Do you know ways that art can be linked to mathematics?"
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 artchives / artists / MATH  SunSITE
The SunSITE Mathematical Art Gallery from the SITO Artchives  images by math artists (under copyright). Fractals and many other kinds of images; with biographies of the artists.
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 Arte Matemática  TV Cultura
Introducões, entrevistas, e programas sobre geometria, números, simetria, perspectiva, tempo, espaço, ritmo, beleza, ordem, caos, o número de ouro, Pítagoras, e mais. Com biografías curtas de autores e artistas.
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 Articulation in Mathematics Education  EXTEND  Perspectives in Mathematics Education
Links to articles on creating smoother transitions between education and work, between school and college and within sectors of higher education, and about preparing teachers to facilitate these transitions and students to respond to new environments.
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 Artistic Exploration of Hilbert Space Filling Curve  Don Relyea
Artist Don Relyea uses a Hilbert space filling curve to create generative
modern art. Page includes interactive demonstrations with source code
examples and and background information on Hilbert curves with links to
further documentation.
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 An Artist's Timely Riddles  Ivars Peterson  Science News Online
The late 19th and early 20th centuries were a time of great popular interest in visualizing a fourth spatial dimension  a concept that appeared to offer painters and sculptors, in particular, an avenue of escape from conventional representation. Moreover,
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 Artlandia Kaleidoscope  Artlandia, Inc.
A fully interactive program based on and available free with the purchase of the software program Artlandia (requires Mathematica 3.0 or higher; available for all platforms that run Mathematica). It
is as easy to use as an ordinary kaleidoscope  create
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 Artlandia  Software for Programmable Creative Graphic Design  Artlandia, Inc.
A Mathematicabased application for artistic interpretation of data and creating mathematical and algorithmic art. The software provides a selection of tools for constructing geometrical objects from numerical arrays, distributing geometric shapes over
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 Artlandia SymmetryWorks  Artlandia, Inc.
A plugin for Adobe Illustrator that automates creation of surface designs and ornaments based on seventeen wallpaper groups.
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 Art Matrix Fractals  H. Smith, J. Staller
Some basic information about fractals; a fractal gallery; and a twohour video for sale on the subject of fractals and chaotic dynamical systems. What is a fractal?; Product line; Wholesale policy; Introduction to Fractals; etc.
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 The Art of Asking Thought Provoking Questions in the Mathematics Classroom  Carmen Bellido, Uroyoan Walker, Keith Wayland
A position paper in PDF format: a "How To" guide for developing higherlevel conceptual questions that provoke students to think. Several techniques for modifying traditional questions are illustrated with examples ranging from elementary to high school
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 The Art of Fractals  Joseph Trotsky; Artis Fractal Gallery
An online fractal exhibition with images grouped into the themes Paintings, Legends and Fairy Tales, Places, Flowers, Foliage, Trees and Forest, Fauna, Landscapes, Classic, Geometric, Marine, Mystic, and Zodiac.
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 The Art of Renaissance Science: Galileo and Perspective  Joseph W. Dauben, McMurry University
A hypermedia essay devoted to the genius of Galileo and the relation between his role in the Scientific Revolution and the equally remarkable achievements of Renaissance artists reflected, in part, in the discovery and application of mathematical perpective.
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 Art of the Grid  Ivars Peterson (MathTrek)
The idea of transferring information from one grid to another has a long history inboth mathematics and art. When the blank grid differs from the original grid, a drawing can suffer intriguing distortions. In art, the result is sometimes called an anamorphic
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 Art of the Tetrahedron  Ivars Peterson (MathTrek)
"Any four points in space that are not all on the same plane mark the corners of four triangles. The triangles in turn are the faces of a tetrahedron. It's the simplest of all polyhedrasolids bounded by polygons... To sculptor Arthur Silverman of New
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 Arts & Crafts Class: Let's Fold Origami  Japan Window Project, Stanford University and NTT
Directions for folding an origami crane and a yakko (in the Edo Period, a Yakko was known as a male servant or a valet to a highclass samurai. The figure shown is a representation from the waist up. The diamond shape is the head and it is possible to
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 ASA Student Poster Competition  American Statistical Association
A competition that encourages students and teachers K12 in the United States and Canada to display data in creative ways. The purpose of the poster is to tell a statistical story visually, illustrating conclusions that can be drawn from data. With links
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 ASCIIMathML  Peter Jipsen, Chapman University
The ASCIIMathML.js script uses a calculatorstyle syntax and your own ASCII or XHTML editor to incorporate mathematical formulas on web pages. See examples by visiting the site with Internet Explorer 6 + MathPlayer or Mozilla/Netscape 7.
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 ASCII Shop  ridiculopathy.com
Graphically lay out and format ASCII art. Toggle through standard keyboard symbols, then "paint" them onto the monospace "canvas," and apply effects such as clearing, lightening, darkening, filling, stroking, blurring, and flaring. To capture a textfriendly
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 Ask Adam Online Mathematics Tutors  Adam Moore
K12 students are invited to fill out a Web form and submit a math question (only one per submission). Tutors may register to answer questions. Some answers are available in Ask Adam's searchable archives. Math tools include online graphing calculator,
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 Ask a Mathematician / Ask a Physicist
"Your math and physics questions answered." Blog posts, which date back to October, 2009, originate from questions posed via email, at the duo's stand at Burningman, in person by friends, or "this one time in Union Square": "How do I find the love of
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 Ask An Expert  Pitsco
Experts on subjects from Amish to Zookeeping. Select from 12 categories with over 300 web sites and email addresses where you can find experts to answer your questions. Ask an Expert is a directory of links to people who have volunteered their time to
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 Ask A Science/Math Expert  Stevens Institute of Technology, Center for Improved Engineering and Science Education (CIESE)
Links to science and math askanexpert services, organized into general science, astronomy and space science, biology and life sciences, physics, oceanography, geology, and weather.
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 AskAScientist Archives  Newton BBS, Argonne National Laboratory
Frequently asked astronomy, biology, chemistry, computer science, engineering, environmental, general, physics, and mathematics question posts, replies from NEWTON, an Electronic Bulletin Board System (BBS) for Science, Math, and Computer Science K12
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 Ask Dr. Callahan  Dale Callahan
For the homeschooling parent who needs high school math and science training material: textbooks, videos for the parent and child, teaching guidelines, tests and test grading guides as well as support for the duration of the course. Courses in geometry,
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 Ask Dr. Math FAQ  Math Forum
Frequently asked questions from the archives of the Math Forum's question and answer service for K12 math students and their teachers, with classic problems, formulas, and other recommended math sites.
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 Ask Dr. Math  Math Forum
The Math Forum's question and answer service for K12 math students and their teachers. A searchable archive is available by level and topic, together with a FAQ.
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 Ask Jeeves for Kids  Ask Jeeves, Inc.
An easy question&answer site where kids can ask questions and find more questions on the topic to choose from. Example: Where can I find information on division?
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 Ask Mr. Calculus  Diamond Bar High School
Advanced Placement (AP) Calculus AB and BC free response questions with solutions, dating back to 1997.
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 Ask Mr. Calculus  Howard Alcosser
Answers to every Advanced Placement (AP) Calculus AB and BC exam since 1997.
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 Asknumbers.com
Online conversions between different measures of length, weight, temperature, pressure, energy, frequency and more.
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