| M5 Home Page |
| About.com | Geometry: An Introduction (Terms) |
| Birmingham Grid for Learning | Shapes |
| Math League | Basic Terms |
| Math League | Geometry |
| Math.com | Geometry Words |
| MathsRevision.net | Shapes |
| Quia | Geometric Terms - List |
| ThinkQuest | Geometry Terminology |
| Harcourt School | Plane |
| Keith Calkins | Undefined: Points, Lines, and Planes |
| Math to Build On | Plane |
| Mount Pisgah Academy | Points, Lines, and Planes |
| Pink Monkey | Basic Concepts in Geometry |
| SparkNotes | Building Blocks of Geometry |
| Geometry Works | Congruent Angles |
| Harcourt School | Congruent |
| Math Education and Technology | Similar Figures |
| Math Education and Technology | Congruent Figures and Triangles |
| Fact Monster | Polygons: How Many Sides? |
| Harcourt School | Polygon |
| Interactive Mathematics | Polygons |
| Keith Calkins | Polygons |
| Kids Newsroom | Other Polygons |
| Math League | Figures and Polygons |
| SparkNotes | Polygons - Terms and Formulae |
| SparkNotes | Defining a Polygon |
| SparkNotes | Different Kinds of Polygons |
| Algebra Lab | Sum of Angles in Polygons |
| Math Reference | Sum of the Interior Angles of a Polygon |
| Mrs. Glosser | Lesson on Perimeter of Polygons |
| Wing Kuen | Constructing the Perpendicular Bisector of a Line Segment |
| Wing Kuen | Constructing the Angle Bisector of an Angle |
| Wing Kuen | Constructing an Angle of 60 Degrees |
| Wing Kuen | Finding the Centers of a Triangle |
| Amby Duncan-Carr | Perimeter |
| Harcourt School | Area |
| Math Education and Technology | Quadrilaterals and Conservation of Area |
| Math League | Area and Perimeter |
| MathsRevision.net | Areas and Volumes |
| Coolmath | Interior Angles |
| Geometry Works | Angle Bisector |
| Interactive Mathematics | Angle Sum of a Triangle |
| Harcourt School | Diagonal |
| Keith Calkins | Diagonals |
| Dave Joyce | Euclid's Elements |
| Dave Joyce | Compass Geometry |
| Harcourt School | Base |
| Harcourt School | Point |
| Keith Calkins | Convex, Nonconvex (Concave), etc. |
| Math Homework Help | Postulates, Theorems, and Corollaries from Geometry |
| Math Reference | Euclid's Postulates |
| Shodor | Shape Explorer |
| Shodor | Area Explorer |
| Birmingham Grid for Learning | Everything You Wanted to Know About Perimeter and Area |
| Funbrain | Shape Surveyor |
| Quia | Area and Perimeter Formulas |
| AAA Math | Geometry |
| AAA Math | Types of Polygons |
| Kids Newsroom | Other Polygons Quiz |
| Math Notes | Basic Geometric Terms |
| SparkNotes | Defining a Polygon - Practice |
| SparkNotes | Different Kinds of Polygons - Practice |
| Quia | Geometric Terms |
| Quia | Triangles and Polygons |
| Mrs. Glosser | Perimeter and Area |
| SCWeb4Free | Areas of Irregular Shapes |
| Teach-nology | Congruent Shapes -1 |
| Teach-nology | Congruent Shapes -2 |
| Teach-nology | Congruent Shapes -3 |
| EdHelper | Geometry Worksheets |