| M5 Home Page |
| Interactive Mathematics | Quadrilaterals |
| MSTE | Exploring Quadrilaterals: Sides and Angles |
| Dummies.com | Getting the Scoop on Squares |
| Pink Monkey | Square, Rectangle, and Rhombus |
| Pink Monkey | Perimeter and Area: Square |
| MSTE | Rectangle: Area, Perimeter, Length, and Width |
| Pink Monkey | Square, Rectangle, and Rhombus |
| Pink Monkey | Perimeter and Area: Rectangle |
| Pink Monkey | Parallelograms |
| Pink Monkey | Perimeter and Area: Parallelogram |
| Pink Monkey | Square, Rectangle, and Rhombus |
| Pink Monkey | Trapezoids |
| Pink Monkey | Perimeter and Area: Trapezoid |
| Coolmath | Interior Angles |
| 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 |
| MathGuide | Quizmaster: Area of a Rectangle |
| MathGuide | Quizmaster: Area of a Parallelogram |
| MathGuide | Quizmaster: Area of a Trapezoid |
| MSTE | Rectangle: Area, Perimeter, Length, and Width |
| AAA Math | Geometry |
| Quia | Geometric Terms |
| RHL School | Perimeter and Area |