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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.
 3-D Drawing and Geometry
- Cathi Sanders
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A Math Forum Summer 1998 Institute project that uses examples of paintings, architecture, etc. to analyze different types of 3-D drawings, and teaches
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- The Area of a Circle
- Jon Basden, Highland Middle School
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A one- or two-period lesson plan in which students use work sheets to cut circles into sectors, rearrange them, and derive the formula for the area of
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- The Area of a Parallelogram
- Jon Basden, Highland Middle School
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A one-period lesson plan in which students use work sheets to cut a parallelogram apart into trapezoids and explore the area of these
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- Building an Icosahedron as a Class Project
- Frederick J. Wicklin
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A Teacher's Guide. This document describes how to build an icosahedron as a class project. The size is up to you. Step-by-step instructions are
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- Chameleon Graphing: The Coordinate Plane
- Ursula Whitcher
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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
- Brown-Herbst, Donnelly, Stratton, Anderson-Nielsen; The Geometry Center
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Materials about symmetry and classification of repeating patterns for students in grades 7-10 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
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An interactive Web-based 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
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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
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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
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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
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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
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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
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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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- Exploring Mathematics Through Quilts
- Debbie Meyer
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From The Apple Barrel Quilt Unit, a cross curriculum patchwork quilt unit that provides hands on math experiences. The Math & Quilts page lists
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- Ferris Wheel
- Jim King, University of Washington
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Physical devices can be modeled using dynamic geometry. A vital tool for moving objects around in the model are the isometries, or distance-preserving
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- Folding Shapes: Are the Sides the Same?
- Janna Moore
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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
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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
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A Web unit designed to introduce young children (K-2) to beginning concepts in geometry: describing shapes, making patterns, building shapes,
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- Magic Squares: Math, History, Geography
- Suzanne Alejandre
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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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- Math, Baseball, and the San Francisco Giants
- Linda Uhrenholt; Pacific Bell Education First
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By answering specific questions about travel expenses, food, tickets, etc., students determine the cost of attending a Giants' game, the time it would
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- Mathematics of Cartography
- Cynthia Lanius
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A map is a set of points, lines, and areas all defined both by position with reference to a coordinate system and by non-spatial attributes. These
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- No Matter What Shape Your Fractions Are In
- Cynthia Lanius
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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
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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
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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
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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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- The Right Time: An Investigation of a Clock's Angles
- Jon Basden, Highland Middle School
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A two-period lesson plan in which students think through the process of determining how many times in a 24 hour period the hands of a clock will form
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- River Crossing (Math Exploration Quilt)
- Rik Littlefield; Hanford School
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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
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- Soma Cube Central
- Jon Basden, Highland Middle School
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Students review the concepts of solid geometry, then try to determine all of the ways that they can join no more than four cubes at their faces in an
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- Studying Polyhedra
- Suzanne Alejandre
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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
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Tangrams, a puzzle that helps develop spatial-visualization skills, may also be used to introduce or reinforce geometric concepts such as congruence,
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- Tell Time with your Feet
- Susan Addington; Mathematics Dept., Calstate-San Bernardino
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"A feet-on math lesson for K-8 students." Find the latitude and longitude of your location and times of sunset and sunrise using a table from the Web;
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- Tessellation Tutorials
- Suzanne Alejandre
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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.
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Geometry Lesson Plans
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