- Timothy Kasper
Screencast geometry lessons, most less than five minutes long, narrated by a seventh grade teacher in Indiana.
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- Toys from Trash - Arvind Gupta
Step-by-step photographic instructions for building elegantly simple, colorful "Math Magic" do-it-yourself manipulatives: Abacus, Flexagon, Triangle Grid, Flat Flexagon, Slipper Insets, Folding Pentagon, Tangram, Paper Octagon, Cylinder and Cone, Area
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- Triangles and Simplices (The Geometry Junkyard) - David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on triangles and their higher-dimensional generalizations (simplices), with a particular interest in partitioning regions into triangles, tetrahedra, or higher dimensional simplices, for various applications
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- triangular prism - Manjit Singh Atwal
Download lessons and worksheets about triangular prisms, including finding surface areas and volumes.
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- Understanding Mathematics: A study guide - Peter Alfeld, University of Utah
A resource and source of encouragement, with questions and Alfeld's comments (Are you frustrated working through heaps of meaningless problems that are all alike? Does the thought "I can look it up if I have to" occur to you frequently? Do you feel that
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- Une Balade dans le Monde des Polyèdres - Maurice Starck
Les polyèdres convexes, non convexes, et intéressants: les polyèdres uniformes, les stellations de l'icosaèdre, des tétraèdres remarquables, le découpage d'un tétraèdre par un plan, les deltaèdres
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- Videodiscovery
A publisher and distributor of innovative multimedia products for educators and families. Laserdiscs and CD-ROMs for the K-12 and college market. Product offerings now include laserdiscs with accompanying software, as well as CD-ROMs for both the school
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- Vi Hart - Vi Hart
Blog, videos of math "doodling," instructions for slicing food mathematically, and more from the self-described recreational mathemusician who considers math a hobby, with "special interests in symmetry, polyhedra, and surreal complexity. This usually
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- Volume of Water in an Aquarium - NASA Lewis Learning Technologies Project
How much water will fit in an aquarium that is shaped like a box and is 10 inches high, 6 inches wide, and 14 inches long? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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- Waldomaths - Ron Barrow
Original applets on number, algebra and graphs; shape, space and measure; probability and data handling, including histograms; investigative tools (quadratic and cubic sequences); core (pure) mathematics; decision mathematics (network graphs and linear
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- Waterman Polyhedra and Maps - Steve Waterman
World maps based on close packing of spheres that resemble B.J.S. Cahill's octahedral butterfly world map, but with only five degree graticule. With links to the mathematics behind the cartography, polyhedra applications, and other original findings.
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- Weekend Projects—Picnic Geometry - Make Podcast
This video shows how to build an icosahedron out of paper plates, cups, or plastic sheeting—and pack some geometry into your next picnic! MAKE's accompanying post provides step-by-step instructions for assembling icosahedra from picnic supplies.
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- Whistler Alley Mathematics - Paul Kunkel
Kunkel's Geometer's Sketchpad lessons convey a conceptual understanding, usually without rigorous proof, with questions and suggestions for extensions: Buffon's Needle (an old probability exercise); Chinese Handcuffs (questions with applications for geometry,
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- Wholemovement - Bradford Hansen-Smith
Bradford Hansen-Smith presents the art and geometry of folding circles. As he explains, "Everything we know about geometry, mathematics, and all spatial arrangement and organization of matter is demonstrated by cutting into the wholeness of the sphere.
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- Wild About Math! - Sol Lederman
Math posts, which date back to October, 2007, have included "10 ways to get wild about Math," "How to square large numbers quickly (part 1)," "26 tips for using learning styles to help your kids with Math," "The algebra of cross-multiplication," "Flexagon
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- Worksheet Works - WorksheetWorks.com
This site generates high quality PDFs of worksheets with the flick of a few checkboxes. Just specify level of difficulty, range of numbers, font size, or other parameters.
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- The World of Geometric Toy - Akira Nishihara
Play with animations and applets of Buckminster Fuller's Tensegrity and the Indian Ball (also known as the flexi-sphere), as well as wire-frame renderings of the torus, the magic ring, the toroflux, the reversible polyhedron, and other objects. Nishihira
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- Y-Math Mathematical Models - Jan de Koning
Models and building boxes for education include magnetically connectable "mathmaker" and "polylinks," and tetrahedron puzzles. Other polyhedral furniture and housewares include cube money-boxes of plywood, copper, and brass; dodecahedron bottle openers;
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- You Can Do The Rubik's Cube - Rubik's, Seven Towns Ltd.
The You CAN Do the Rubik's Cube Solution Kit offers teachers lesson plans, homework sheets, and answer keys aligned to national standards as well as 19 state frameworks, anchors and 21st Century Skills. Lessons and activities support Geometry, Algebra
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- Zome: Truncated 120-cell - PCMI @ Math Forum: SSTP 2007
One of the activities at the 2007 Secondary School Teachers Program in the Park City Mathematics Institute was the construction of a truncated 120-cell using Zometool. View both an explanation of the mathematics and photos of the construction.
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