| M5 Home Page |
| Interactive Mathematics | Quadrilaterals |
| Kids Newsroom | Quadrilaterals |
| MSTE | Exploring Quadrilaterals: Sides and Angles |
| CITE | Area of a Square |
| CITE | Perimeter of a Square |
| Dummies.com | Getting the Scoop on Squares |
| Pink Monkey | Square, Rectangle, and Rhombus |
| Pink Monkey | Perimeter and Area: Square |
| WebMath | Squares |
| Amby Duncan-Carr | Finding the Area of a Rectangle |
| CITE | Area of a Rectangle |
| CITE | Perimeter of a Rectangle |
| Jim Reed | Area and Perimeter of Rectangles and Squares |
| Mrs. Glosser | Lesson on Area of Squares and Rectangles |
| MSTE | Rectangle: Area, Perimeter, Length, and Width |
| Pink Monkey | Square, Rectangle, and Rhombus |
| Pink Monkey | Perimeter and Area: Rectangle |
| Rainer Radok | Area of Square and Rectangle |
| WebMath | Rectangles |
| CITE | Area of a Parallelogram |
| Go Math | Parallelogram |
| Harcourt School | Parallelogram |
| Pink Monkey | Parallelograms |
| Pink Monkey | Perimeter and Area: Parallelogram |
| Rainer Radok | Area of Parallelogram |
| Pink Monkey | Square, Rectangle, and Rhombus |
| Zona Land | The Rhombus |
| CITE | Area of a Trapezoid |
| Go Math | Trapezoid |
| Mrs. Glosser | Lesson on Area of Trapezoids |
| Pink Monkey | Trapezoids |
| Pink Monkey | Perimeter and Area: Trapezoid |
| Rainer Radok | Area of Trapezoid |
| Zona Land | The Trapezoid |
| Coolmath | Interior Angles |
| Math Education and Technology | Quadrilaterals and Conservation of Area |
| Math to Build On | Degrees: Circles, Triangles, Rectangles, Squares |
| Math2.org | Areas, Volumes, and Surface Areas |
| Maths Tutor | Areas and Volumes (i) |
| Mrs. Glosser | Lesson on Perimeter of Polygons |
| Purplemath | Geometric Formulae Review |
| AAA Math | Perimeter of a Parallelogram |
| AAA Math | Perimeter of a Rectangle |
| AAA Math | Perimeter of a Square |
| AAA Math | Area of a Trapezoid |
| AAA Math | Area of a Parallelogram |
| AAA Math | Area of a Rectangle |
| AAA Math | Area of a Square |
| JRW | Areas and Volumes |
| MathGuide | Quizmaster: Area of a Rectangle |
| MathGuide | Quizmaster: Area of a Parallelogram |
| MathGuide | Quizmaster: Area of a Trapezoid |
| Exeter CIMT | Area and Perimeter of a Square |
| Exeter CIMT | Area and Perimeter of a Rectangle |
| Exeter CIMT | Area of Compound Shapes |
| Math Notes | Rectangles and Squares |
| Math Notes | Parallelograms and Trapezoids |
| MSTE | Rectangle: Area, Perimeter, Length, and Width |
| Kids Newsroom | Quadrilaterals Quiz |
| A+ Math | Geometry Flashcards |
| A+ Math | MATHO Geometry Game |
| A+ Math | Geometry Hidden Picture Game |
| AAA Math | Geometry |
| Quia | Geometric Terms |
| Go Math | Trapezoid Worksheet |
| Go Math | Parallelogram Worksheet |
| RHL School | Perimeter and Area |
| SCWeb4Free | Areas of Parallelograms |