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  All Sites - 388 items found, showing 301 to 350

  1. Rectilinear Geometry (The Geometry Junkyard) - David Eppstein, Theory Group, ICS, UC Irvine
    An extensive annotated list of links to material on geometric problems defined on squares and rectangles, higher dimensional boxes, cubes, and hypercubes, right triangles and other right-angled figures, and "taxicab geometry" in which distances are measured ...more>>

  2. Religious Beliefs Made Visual: Geometry and Islam - Jane Norman, Consultant, Metropolitan Museum of Art
    Although the shapes and structures are based on the geometry of Euclid and other Greek mathematicians, Islamic artists used them to create visual statements about religious ideas. A discussion of the use of geometric motifs in Islamic art, with instructions ...more>>

  3. The Right-Angle Triangle Solver - Steve Ayers
    Input two sides of a right triangle, or one of its sides and one of its angles, and this site calculates the remaining sidelengths and angles. Also, convert decimals and fractions, and imperial and metric units of measure. Requires JavaScript. ...more>>

  4. Rigol'Math: énigmes, problèmes et curiosités mathématiques - Jean-Marc Deleuze
    Le calcul de Pi; le Jeu de Nim; Convertisseur base 10 --> base 2; Multiplier sur les doigts; Multiplication égyptienne; Le carré magique; TicTacToe; Coloriage; et beaucoup plus. ...more>>

  5. Rite Item - Jim Preston
    Software to download: ANYANGLE (Windows, DOS; a geometry solver that provides a method of finding answers to problems involving triangles, and offers scale views and supplementary data to back up the numerical results); and PARTYDOT (a program for creating ...more>>

  6. River Crossing (Math Exploration Quilt) - Rik Littlefield; Hanford School
    You want to cross a river to reach a point exactly opposite where you are currently standing. Explore this problem step-by-step, encountering the following basic ideas: 1) Pythagorean theorem; 2) time = distance / speed; 3) distance = time * speed; 4) ...more>>

  7. Rockin' the Standards
    Musical recordings by a rock band led by a veteran elementary school teacher who takes the lyrics from common tunes and changes them to help kids remember what they've been taught in school. Each of the fourteen songs on the album "Rockin' the Standards ...more>>

  8. Ron Blond - Ron Blond
    Circle geometry applets to explore inscribed and central angles, tangents and radii, and tangents and inscribed angles. Also, applets illustrating the quadratic function (completed square and the discriminant), transformations of the sine and cosine functions, ...more>>

  9. Science Museum Math Exhibit - The Geometry Center
    A museum exhibit on triangle tilings that contains sophisticated concepts such as tilings of the sphere and the relation between tilings and the Platonic and Archimedean solids: the sum of the angles of a planar triangle is always 180 degrees. Repeated ...more>>

  10. Science Museum of Minnesota
    Natural history and technology. See the world's largest Camptosaurus dinosaur skeleton, touch a tornado, play the congas, do some serious Internet surfing, or test the waters of the Mississippi River. The museum is Minnesota's most popular indoor cultural ...more>>

  11. Search New York Journal of Mathematics (NYJM) - Department of Mathematics and Statistics, State University of New York (SUNY) at Albany
    Search the contents of all years of the journal, or search individual years, 1994-present. ...more>>

  12. Secondary Math Units - Margaret Sinclair
    Units for grades 9-12. For grades 9-10: Data Collecting in the Classroom, Algebraic Problem-solving using Spreadsheets (a unit that emphasizes moving from numerical to symbolic representation), and a newspaper review unit on the Skydome. For grades 11-12: ...more>>

  13. Secrets of the Beehive - Keith Devlin; Guardian Unlimited Archive
    The 4th century geometer Pappus was one of several ancient Greek mathematicians who suspected that the elegant shape of the honeycomb was a result not of an innate bee-sense of geometric beauty but of nature's efficiency. The repeating pattern of six-sided ...more>>

  14. Semiregular Tessellations - Totally Tessellated
    Color renditions and real examples of the semiregular tessellations. Templates allow you to print renditions of each tessellation suitable for coloring activities. ...more>>

  15. ShapeGame - Architectronics, Inc.
    Drag shapes on, drag shapes off: triangles, squares, hexagons, rhombuses, and trapezoids. Also, change their color, orientations, and more. ...more>>

  16. Shelley Walsh
    Syllabi and notes for math courses from arithmetic review to beginning calculus. Download MathHelp a tutorial program with problem sets for Mac or PC, or learn how to use MathHelp to create your own tutorials. Brief Mathematics Articles present concepts ...more>>

  17. The Shikaku Room - Paul Hutchinson
    Given a few numbered squares in a larger grid, block out rectangular and square sections so that each component piece contains the one number that represents its area. Randomly generate or create your own grids — from 4 × 4 up to 20 × ...more>>

  18. Similarity - Project MATHEMATICS!, California Institute of Technology
    A videotape-and-workbook module that explores a basic topic in high school mathematics in ways that cannot be done at the chalkboard or in a textbook. Scaling multiplies lengths by the same factor and produces a similar figure. It preserves angles and ...more>>

  19. Similarity (SMILE) - Natalia Kee, Harlan Community Academy High School
    A lesson designed to teach students to discover the factor of proportionality in similar polygons and relate this factor to the perimeters and areas of similar polygons. From the Geometry and Measurement section of a collection of almost 200 single concept ...more>>

  20. simpsonsmath.com - Sarah J. Greenwald and Andrew Nestler
    The animated sitcom The Simpsons "contains over a hundred instances of mathematics, many designed to expose and poke fun at innumeracy," which make it "an ideal source of fun ways to introduce important concepts to students, and to reduce math anxiety ...more>>

  21. Sketches for Cabri Geomètre (v. 1) - L. J. Dickey, University of Waterloo
    Cabri Geomètre (the original version of of the program) figures to download (binhexed): Conic Given by Five Points; Ten Sketches of Desargues Theorem; Harmonic Conjugates; The Inverse of a Circle; The Inverse of a Line; The Inverse of a Point; ...more>>

  22. The Sliding Triangle - Paul Kunkel
    Investigate ellipses by tracing triangle transformations. ...more>>

  23. Software - Bill White
    These Flash apps provide online practice deriving some unknown property of a figure given its other measures. Find the area of a trapezoid given its two base lengths and height; find one of its bases given its area and height; find its height given its ...more>>

  24. Some Variations on the Theme of Polyominos - Recmath
    Patterns that illustrate how the squares of polyominos are connected to each other. Examples of polyominos with a grid superimposed to illustrate the individual squares; with a line that joins the mid-point of two adjacent square if the squares are connected. ...more>>

  25. Spidron System - Daniel Erdely
    Erdely calls a planar, plane-filling object a Spidron. Upon three-dimensional deformation subject to specific constraints, the planar system generates a regular, dynamic, geometrical construction. Erdely's experiments have led to the idea of creating ...more>>

  26. Square Machine (Early Childhood Art Lessons, Arts Wire) - The Incredible Art Department
    A "lesson plan" for ages 3-5. "What's a square? Squares are all over the place. Look at these square things..." ...more>>

  27. Square of the Hypotenuse - Ivars Peterson (MathTrek)
    Some history of the legend of the discovery of the Pythagorean theorem: in his textbook The History of Mathematics, Roger Cooke of the University of Vermont describes how the Babylonians might have discovered the Pythagorean theorem more than 1,000 years ...more>>

  28. Square Wheel (MatheMUSEments!) - Ivars Peterson (Math Muse for Kids)
    A square wheel may be the ultimate flat tire. There's no way it can roll over a flat, smooth road without jolting the rider again and again. Stan Wagon, a mathematician at Macalester College in St. Paul, Minnesota, has a bicycle with square wheels. It's ...more>>

  29. The STEM Collaborative - Maryland Public Television, Arkansas Educational Television Network, Alabama Public Television, and Kentucky Educational Television
    The four online adventures Scale City, ProportionLand, Math by Design (architecture), and Rock 'n Roll Road Trip (music) engage students to use geometry, algebra, and proportional reasoning for skateboard ramps, cooking, amusement park roller coasters ...more>>

  30. Stickets - Wanderlands
    A puzzle game for iPhone "that forgot Tetris existed": drag tri-colored L-shaped blocks onto a grid and tap contiguous, similarly colored areas comprised of three or more squares in an ongoing quest to preserve space on the grid. The app also challenges ...more>>

  31. The Story of Pi - Project MATHEMATICS!, California Institute of Technology
    A videotape-and-workbook module that explores a basic topic in high school mathematics in ways that cannot be done at the chalkboard or in a textbook. Although pi is the ratio of circumference to diameter of a circle, it appears in many formulas that ...more>>

  32. 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 ...more>>

  33. Tangrams: History, Puzzles, Make It, and Links - Randy Crawford
    Follow the "history" link to learn about tangrams through the ages; click on "puzzles" for over 100 silhouettes to reconstruct, with solutions. "Make it" provides instructions for building your own tangram set. With references to more sites, software, ...more>>

  34. 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 one-button mouse) click while holding ...more>>

  35. Tangrams - Tom Scavo
    Tangrams, a puzzle that helps develop spatial-visualization skills, may also be used to introduce or reinforce geometric concepts such as congruence, similarity, symmetry, etc. This unit for grades 4 through 6 uses tangrams to compute the area of polygons  ...more>>

  36. Tanzzle™ - Franco Cocchini
    Software for exploring tangrams. View published patterns and/or submit one of your own. Request a free license for schools and educational programs. Free 30-day trial; free viewer download. Choose from four different sets of pieces: Tangram (traditional ...more>>

  37. Teaching Ideas for Primary Teachers: Maths
    Math activities for ages 5-11 include a puzzle display, shapes worksheets, ideas for making a maths dictionary, a questioning technique, and many more games, worksheets, and activities for the classroom. ...more>>

  38. Teaching-Tools.com - Teaching-Tools
    Create math practice worksheets: multiplication tables with exercises, whole numbers, decimal and fraction operations, matching exercises for math terms, geometry terms, and 'story problems' clue words, an identifying geometry shapes exercise, and an ...more>>

  39. Team Umizoomi - Viacom International Inc.
    Milli, Geo, and Bot solve everyday math problems with their "Umifriend" preschoolers. Get Mighty Math crafts, games, printables, and recipes. Download episodes of this animated live-action series broadcast on Nickelodeon's Nick Jr. television show. ...more>>

  40. Technologies: Past and Future - Cut the Knot!, Alexander Bogomolny, with Don Greenwell
    A discussion of the similarities in browsing through books and surfing the Internet, the serendipitous discoveries that can be made, fallacious geometric and other puzzles, and an interesting integer matrix, with recommendations of books to read and sites ...more>>

  41. A Template for Napoleon's Theorem Explorations - Steve Weimar, with Sarah Seastone
    Some suggestions for things to investigate related to Napoleon's Theorem. Includes a sample sketch. ...more>>

  42. Tessellated Polyhedra - Jill Britton
    Full-page printable nets of each of the regular polyhedra, decorated with individual surface tessellations in full color. A higher-resolution black-and-white version of each tessellated net appears in Polyhedra Pastimes, by Jill Britton, published by ...more>>

  43. The Theorem of Pythagoras - Project MATHEMATICS!, California Institute of Technology
    A videotape-and-workbook module that explores a basic topic in high school mathematics in ways that cannot be done at the chalkboard or in a textbook. Several animated proofs of the Pythagorean theorem are presented, with applications to real-life problems ...more>>

  44. There are trisectable angles that are not constructible - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    Why certain angles that are trisectable cannot be constructed by traditional methods. ...more>>

  45. TheXorb - Jagan Deb
    Online calculators for the slope and y-intercept of linear equations; standard deviations; mean, mode, and range; the Pythagorean Theorem; and properties of geometric figures such as triangles, squares, circles (circumference given area; area given diameter; ...more>>

  46. A Thing In Common - Cut the Knot!, Alexander Bogomolny
    Two applets, both of which use the Pythagorean theorem: a puzzle (Draw an {N/D} star polygon - a polygon whose N vertices are uniformly distributed on a circle, but each vertex is connected to its D-th neighbor. Regular polygons correspond to D = 1, and ...more>>

  47. Things Impossible - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
    Essays on impossible things, including trisecting an angle, doubling a cube, squaring a circle, moving pegs five places in one direction (via checker-jumps), finding the center of a given circle with the straightedge alone, representing the square root ...more>>

  48. Thinking Fountain - Science Museum of Minnesota
    Thinking Fountain offers surprising and personal connections to science. It's a living card file full of ideas and activities. Includes the opportunity to add your own projects. See Shapes Cluster: Shapes & Math: Shape Walk, I C Shapes, Bubble Geometry, ...more>>

  49. Thinking Fountain Shape Cluster - Science Museum of Minnesota
    Activities, images, and experiments relating science, math, and language arts. The shapes and math cluster features shape walk, I C shapes (finding circles, squares, and triangles in everyday objects), soap bubble geometry, pyramids and cubes (building ...more>>

  50. The Three Jugs Problem - Cut the Knot!, Alexander Bogomolny
    Two friends who have an eight-quart jug of water wish to share it evenly. They also have two empty jars, one holding five quarts, the other three. How can they each measure exactly 4 quarts of water? ... The description of the 3 Jugs problem as a triple ...more>>

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