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Lesson Plans: Geometry
This list contains some of the best geometry lesson plans or
materials on which to base them. For a more exhaustive list, or to find
materials that fit your specific needs, search or browse Geometry or Lesson
Plans in the Forum's Internet Mathematics Library.
 3D Drawing and Geometry
 Cathi Sanders

A Math Forum Summer 1998 Institute project that uses examples of paintings, architecture, etc. to analyze different types of 3D drawings, and teaches
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 Building an Icosahedron as a Class Project
 Frederick J. Wicklin

A Teacher's Guide. This document describes how to build an icosahedron as a class project. The size is up to you. Stepbystep instructions are
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 Chameleon Graphing: The Coordinate Plane
 Ursula Whitcher

A Web unit that introduces the coordinate plane, for elementary and middle school students. With the help of Sam the Chameleon, learn to find points
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 Classification of Patterns
 BrownHerbst, Donnelly, Stratton, AndersonNielsen; The Geometry Center

Materials about symmetry and classification of repeating patterns for students in grades 710 using wallpaper patterns, to be used as either an
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 Concurrency Points in a Triangle
 Brakalova, Johnson, Scalzitti, Thornberry; The Geometry Center

An interactive Webbased exploration designed to facilitate the teaching of triangle concurrency, both as an integral part of a geometry curriculum
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 Crystals: Crystallography & Systems
 Suzanne Alejandre

A Math Forum Web Unit. Students studying polyhedra enjoy seeing the structures as they occur in the real world. Crystalline structures can be
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 Designs with Circles
 Suzanne Alejandre

A Math Forum Web Unit. Includes some background on circles in Islamic cultures, and an activity exploring the geometry involved in some circle
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 Dominoes Activity
 Suzanne Alejandre

A classroom activity (similar to Pentomino + 1 = Hexomino; a variation on polyominoes) aligned to the NCTM and California Standards, to be explored
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 Dueling Pinwheels  A Geometer's Sketchpad Activity
 Cynthia Lanius

Construction directions for rotations, translation, and reflection, with questions to explore and a demonstration sketch to
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 EggMath
 Bradlow, Sullivan, Levy, UIUC

A collection of modules (including many interactive applets) for K12 classrooms, based on the theme of eggs. Topics include: the shape of an egg
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 Euclid's Geometry: History and Practice
 Alex Pearson, The Episcopal Academy, Merion, Pennsylvania

A series of interdisciplinary lessons on Euclid's Elements, researched and written by a Classicist and hosted by the Math Forum. The material is
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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
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 Folding Shapes: Are the Sides the Same?
 Janna Moore

Folding Shapes gives students practice in identifying typical shapes (circles, squares, triangles, etc.), in the process of teaching about lines of
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 Geometric Factoring
 Suzanne Alejandre

A Math Forum Web Unit. Understanding factoring through geometry: students work cooperatively to display a numeral as the area of a rectangle, and make
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 Introduction to Geometry for Primary Students
 Varnelle Moore

A Web unit designed to introduce young children (K2) to beginning concepts in geometry: describing shapes, making patterns, building shapes,
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 Magic Squares: Math, History, Geography
 Suzanne Alejandre

Designed primarily for middle school and older elementary school students, this Math Forum Web unit includes classroom activities for four different
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 Mathematics of Cartography
 Cynthia Lanius

A map is a set of points, lines, and areas all defined both by position with reference to a coordinate system and by nonspatial attributes. These
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 No Matter What Shape Your Fractions Are In
 Cynthia Lanius

Students explore geometric models of fractions and discover relations among them, reinforcing their knowledge of fractions by using online pattern
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 PlaneMath
 InfoUse, in cooperation with NASA

Materials for elementary school students about math and aeronautics, designed to stimulate and motivate students with physical disabilities in grades
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 Polyhedra in the Classroom
 Suzanne Alejandre

Middle School student activities to pursue with a computer in the classroom. Introduction to Polyhedra; paper nets to print out and fold; Kaleidotile;
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 Rectangle Pattern Challenges
 Cynthia Lanius

Examine different stges of rectangle patterns, and describe what you must do to get from one to the next. Observe the designs looking for patterns.
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 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 stepbystep, encountering the
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 Studying Polyhedra
 Suzanne Alejandre

What is a polyhedron? A definition and a Java applet to help in exploring the five regular polyhedra to find how many faces and vertices each has, and
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 Tangrams
 Tom Scavo

Tangrams, a puzzle that helps develop spatialvisualization skills, may also be used to introduce or reinforce geometric concepts such as congruence,
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 Tessellation Tutorials
 Suzanne Alejandre

A series of tutorials that teach students how to tessellate (somewhat in the style of the art of M.C. Escher) using HyperCard for black and white
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 For more, search or browse Geometry or Lesson
Plans in the Forum's Internet Mathematics Library.
