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I have gathered many lists of online resources for geometry. The games and activities are grouped topics—please see the following menu.

This page itself contains a list of general geometry websites, worksheets, and books.

Angles

Coordinate plane

Congruent transformations

Similar figures

Circle / Pi

Constructions

The Pythagorean Theorem

General geometry websites

Worksheets

Books

Advanced topics

## **General geometry websites**

**Geometry - Math Warehouse**

Detailed lessons about angles, triangles, quadrilaterals, circles, similar triangles, parallelograms, polygons, and trapezoids.

www.mathwarehouse.com/geometry

**Geometry course from Learning Math**

This online geometry course includes readings, problems, videos, interactive activities, homework problems and solutions. It is meant for K-8 teachers but will work well for middle school students as well.

www.learner.org/courses/learningmath/geometry

**Absorb Mathematics**

Absorb Mathematics is an excellent interactive course written by Kadie Armstrong, a mathematician. The lessons in it contain interactivity, explanations, and quiz questions. The course concentrates on geometry and trigonometry but includes a few other topics as well. While most of the content is accessible by a fee only, some lessons are available as free samples.

www.absorblearning.com/mathematics/contents.html

**BBC Bitesize Shape and space**

Short revision (review) "bites" with some activities and short tests for middle/high school level. Topics include shapes, angles, transformations, lines, polygons, symmetry, circles, Pythagorean Theorem, and constructions.

www.bbc.co.uk/schools/ks3bitesize/maths/shape_space

**Geometry Homework Help from Math.com**

Basic tutorials and quizzes on common geometry topics found in middle and high school.

www.math.com/homeworkhelp/Geometry.html

**Geometry Reference Sheet**

Both online and printable versions; includes area and volume formulas for common shapes plus Pythagorean Theorem.

www.eeweb.com/toolbox/geometry-reference-sheet

**Geometry Tutorials**

Simple tutorials on triangles and their properties, polygons, symmetry, angles and much more. Also includes lots of solved geometry questions and some interactive applets.

www.analyzemath.com/geometry.html#tutorials

**Dynamic Geometry® Explorations**

A bunch of interactive geometry activities, along with instructions and questions to guide your exploration. Need a Java-enabled browser.

math.kendallhunt.com/x19812.html

**National Library of Virtual Manipulatives for Interactive Mathematics: Geometry**

Collection of interactive geometry activities: Congruent triangles, fractals, geoboard activities, Golden rectangle, Ladybug leaf, Ladybug mazes, platonic solids, tangrams, tessellations, transformations and more.

nlvm.usu.edu/en/nav/category_g_3_t_3.html

**Great Pyramid**

Clear instructions on how to make a scale model of the GreatPyramid at Giza out of paper.

mathforum.org/alejandre/mathfair/pyramid2.html

**Key to Geometry Workbooks**

Here is a non-intimidating way to prepare students for formal geometry. *Key to Geometry* workbooks introduce students to a wide range of geometric discoveries as they do step-by-step constructions. Using only a pencil, compass, and straightedge, students begin by drawing lines, bisecting angles, and reproducing segments. Later they do sophisticated constructions involving over a dozen steps-and are prompted to form their own generalizations. When they finish, students will have been introduced to 134 geometric terms and will be ready to tackle formal proofs.

## Worksheets

**Math Mammoth Geometry Worksheets Collection**

A collection of quality worksheets with variable problems for grades 3-8. Topics include angle relationships, triangles, quadrilaterals, congruency, similar figures, constructions, area, volume, and the Pythagorean Theorem. Price: $9.00 download.

www.mathmammoth.com/worksheets/geometry.php

**Geometry worksheets & quizzes**

Worksheets about complementary and supplementary angles, parallel, perpendicular, and intersecting lines, types of angles, basic shapes, area & perimeter of rectangles, and parts of a circle.

www.dadsworksheets.com/v1/

**Geometry worksheets & quizzes**

A bunch of PDF worksheets on geometry topics for elementary level, plus online quizzes.

www.math4children.com/Topics/Geometry

**Maisonet Math**

Worksheets and online quizzes on a variety of geometry (and other) topics. Look for the links in the left sidebar for Angles, Area, Circumference, Geometry, Transformations, and Volume.

www.mrmaisonet.com

**MathKinz - Geometry**

A few free geometry worksheets, most are for grades 2-5.

mathkinz.com/Geometry.php

**High School Measurement Worksheets**and **Geometry Worksheets**

From FunMaths.com website, written by teachers from all over the world.

www.funmaths.com/worksheets/math_measurement_06.htm and

www.funmaths.com/worksheets/math_geometry_02.htm

**Let's Practice Geometry - Free Worksheets**

Lots of free worksheets for high school geometry, including topics such as the Pythagorean Theorem, perimeter, area, volume, angle relationships, triangle theorems, similarity and congruence, logic, proofs, trig, polygons, and circles.

www.letspracticegeometry.com/free-geometry-worksheets

**Geometry worksheets at AGMath.com**

Hundreds of free PDF worksheets for high school geometry topics, including geometric constructions, triangle congruence, circle, area, the Pythagorean Theorem, solid geometry, and similarity. The worksheets are loosely based on the "Discovering Geometry" textbook by Michael Serra. Compiled by math teacher Jason Batterson.

AGmath.com/1973.html

**Key to Geometry Workbooks**

Here is a non-intimidating way to prepare students for formal geometry. *Key to Geometry* workbooks introduce students to a wide range of geometric discoveries as they do step-by-step constructions. Using only a pencil, compass, and straightedge, students begin by drawing lines, bisecting angles, and reproducing segments. Later they do sophisticated constructions involving over a dozen steps-and are prompted to form their own generalizations. When they finish, students will have been introduced to 134 geometric terms and will be ready to tackle formal proofs.

## Books

**Math Mammoth Geometry 1**

A textbook/workbook together for grades 3-5. You will learn geometry by drawing. Topics covered include angles, rectangles, parallelograms, polygons, circles, area, perimeter, and volume. Price: $6.90 download, $12.70 printed.

www.mathmammoth.com/geometry_1.php

**Math Mammoth Geometry 2**

A textbook/workbook together for grades 6-7. It continues the study of geometry after Math Mammoth Geometry 1, continually emphasizing conceptual understanding, besides calculation-type exercises. Price: $5.70 download, $10.40 printed.

www.mathmammoth.com/geometry_2.php

**Geometry: A Guided Inquiry**

An excellent choice for high school geometry. I've written an in-depth review of this book and of its supplement *Home Study Companion - Geometry*, latter by David Chandler.

www.amazon.com/gp/product/0895824302

**Harold Jacobs Geometry**

A popular choice for a geometry textbook among homeschoolers, and well written. Please read my review.

www.amazon.com/gp/product/0716743612

**Dr. Math Introduces Geometry: Learning Geometry is Easy! Just ask Dr. Math!**

A supplement to middle school geometry, *Dr. Math Introduces Geometry* has a light tone, clear layout, and humorous cartoons by Jessica Wolk-Stanley. The best part is that the explanations to math questions are accurate and clear. You'll find answers to dozens of real questions from students who needed help understanding the basic concepts of geometry. This book covers angles, triangles, quadrilaterals, area, perimeter, Pi, circle parts, polyhedra, surface area, volume, nets, congruent transformations, and symmetry. Price ~$12 new, ~$1-6 used.

www.amazon.com

**Dr. Math Presents More Geometry**

An inexpensive companion to any high school geometry course with excellent explanations. Read my review.

www.amazon.com/gp/product/0471225533

**Kiselev's Geometry / Book I. Planimetry**

A famous Russian geometry book translated. Acclaimed for the clarity of exposition which makes the book accessible for 7th graders.

www.amazon.com/gp/product/0977985202

**A High School First Course in Euclidean Plane Geometry**

This is a high school geometry course by Charles Aboughantous. It is based on Euclid's five postulates and his most common theorems. It promotes the art and the skills of developing logical proofs. Practice problems are included at the end of each chapter in three groups: geometric construction problems, computational problems, and theorematical problems. The answers to the computational problems are included at the end of the book. The solutions manual of the book contains detailed solutions to all the problems in the book. It is free to home schooled students upon proof of purchase of the book. Samples are found at https://home.earthlink.net/~draboughantous/geometry.html

www.amazon.com/gp/product/1599428229

## **Advanced topics**

**Go Geometry**

All things geometry: geometry theorems, huge list of geometry problems, presented with visual diagrams, geometric art, puzzles, dynamic geometry, and more.

gogeometry.com

Why is High School Geometry so Difficult

And what to do about it. In this article, I investigate the reasons and remedies for why so many students find their high school geometry course to be difficult.

/teaching/geometry.php

**Tim's Triangular Page**

Lists all the basic facts about triangles followed by some problems.

sakharov.net/triangle.html

**How to Write a Solution**

An article exploring aspects of how to write a clear solution - or proof. Meant for college students but helpful for anyone who wants to learn to write mathematical proofs.

www.artofproblemsolving.com/Resources/

**Euclid's Elements**

A set of Java applets that bring to life the theorems in Euclid's *Elements*.

aleph0.clarku.edu/~djoyce/java/elements/elements.html

**NonEuclid**

Interactive Java software for creating ruler and compass constructionsin both the Poincaré disk and the upper half-plane models of hyperbolic geometry. See also, *Why is it Important for Students to Study Hyperbolic Geometry?*

cs.unm.edu/~joel/NonEuclid/NonEuclid.html

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