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  1. Parallelogram - Wikipedia

  2. Parallelograms. Properties, Shapes, Sides, Diagonals and Angles …

  3. Parallelogram - Shape | Definition | Formulas, Properties, Examples

  4. Parallelepiped- Definition, Volume and Area Formula, Example

  5. Parallelepiped: Formulas, Definition, Volume, Area, Examples

  6. Parallelogram - Math.net

  7. Parallelogram - Math Steps, Examples, Properties & Questions

  8. Parallelogram - Definition, Types, Properties, Shapes, Examples

  9. Parallelogram - Math is Fun

  10. Parallelogram - Definition, Types, and Examples - Basic-mathematics.com