

 A B Cron Portal  Auston B. Cron
GeoGebra applets by a teacher who has taught high school and early college students since 1970, and uses his dynamic geometry animations and interactive sketches in his classes to teach angle sums; perimeters and areas of rectangles and squares; reference
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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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 Edwards  Clayton Edwards
Problems, lessons, units, and "starters" by a middle grades math teacher who believes in differentiation and "using a mixture of traditional and reform methods to solidify understanding and engage mathematical minds": integer operations, order of operations,
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 Ferris Wheel  Jim King, University of Washington
Physical devices can be modeled using dynamic geometry. A vital tool for moving objects around in the model are the isometries, or distancepreserving transformations. This model of a Ferris wheel provides a good example. A stepbystep description of
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 Geometer's Sketchpad: Introductory Lab  Mike Riedy
A beginning tutorial, with worksheets, for using GSP. Lab is organized into five parts: Preliminary Setup (formatting a disk, starting and quitting the Geometer's Sketchpad, making mistakes); Toolbox (introduction to the GSP tools: circle, select, point,
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 Geometric Functions  Scott Steketee
Activities to develop function concepts with the "compelling kinesthetic experiences and opportunities for explicit discourse" available through geometric transformations (reflections, rotations, translations). Geometric Functions resources fulfill the
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 Geometry in Motion  George Beck; MathSource
Mathematica notebooks. MapPoint is a geometry program that combines the traditional geometric constructions of classical Euclidean geometry with the more dynamic geometric transformations of modern geometry. Many examples are given showing how to create,
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 IMATH  Cathleen V. Sanders
A professional development course for teachers designed to help them integrate technology and the NCTM Standards into their teaching. Although this course is only available for credit to Hawaii teachers, teachers from other states may participate in the
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 Insert Clever Math Pun Here  Meg Craig
Blog chock full of original classroom assignments and handwork samples. Posts by the Birmingham (Alabama) math teacher, which date back to July, 2014, have included "Equation Editor Awesomeness," "#mtboschallenge 123 Sunday Summary," "The Bagel AwardWinning
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 Mathematical Circles Topics  Tom Davis
Mathematical Circles are for students of high school age or younger who want to increase their abilities to reason about mathematical problems. Students who study in circles learn to do mathematical olympiadstyle problems (essay or proofs, not quick
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 Mathematics Experiences Through Image Processing (METIP)  Steve Tanimoto; Dept. of Computer Science & Engineering, Univ. of Washington
A project designed to produce and test materials that promote digital image processing as a means of motivating K12 students in mathematics and to teach mathematical concepts, encouraging teachers and students to experiment firsthand with digital images
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 The Mathman  Don Cohen
Materials for sale for K12 students, teachers and parents; precalculus. Materials include Get Ready for Calculus (Calculus By and For Young People book, CDROM, worksheet book, videotapes and map) and Changing Shapes with Matrices. Patterns, visualization,
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 Mr. Bunker's Fathom Lessons  Mr. Bunker, Boston Latin School
Instructions, some illustrated, for using Fathom to graph and analyze data sets about the 1970 draft lottery, Major League Baseball batting leaders, Boston Latin School math teachers, and algebraic transformations. Also, see group projects from the class
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 ReInventing FourthGrade Mathematics  Jack J. Lopez; Kodak
A series of four related activities through which students acquired a firm, active knowledge of some of the basic terminology of Euclidean geometry, learning the vocabulary for describing various geometric shapes and transformations. Students photographed
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 Secondary Math Units  Margaret Sinclair
Units for grades 912. For grades 910: Data Collecting in the Classroom, Algebraic Problemsolving using Spreadsheets (a unit that emphasizes moving from numerical to symbolic representation), and a newspaper review unit on the Skydome. For grades 1112:
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 Sketchpad for Little Ones  Geri AndersonNielsen; Georgetown Day School
The Geometer's Sketchpad (GSP) is a powerful tool for discovering geometric properties. The program contains a ruler, a protractor, a calculator, and a simple word processor, in addition to graphing possibilities for the Cartesian plane. The activities
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 Transformations and Tessellations  Lynda Kozicz Leahey
A unit introducing the concepts of transformations and tessellations. Students will explore the attributes of transformations: reflections, translations, rotations and dilations by using pattern blocks, algebraic notation and computer design. They will
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 Transformations  David A. Reid
A transformation is a onetoone mapping on a set of points. The most common transformations map the points of the plane onto themselves, in a way which keeps all lengths the same. These transformations are called isometries. Another common sort of transformation
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 Visual Structure of Postulates and Axioms in Algebraic Operations
(SMILE)  Sanford Olshan, Roosevelt High School
A lesson designed to reinforce and retain the use of axioms and postulates in various proofs and linear transformations of equations; and to have student build a physical model of the game of "PRUFF" either as a card game or as a board game. From the
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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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