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  1. Quadrilaterals - Square, Rectangle, Rhombus, Trapezoid, Parallelogram

  2. Parallelogram - Wikipedia

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

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

  5. Properties of Parallelogram - Theorems, Proof, Examples | Parallelogram

  6. Parallelogram - Math is Fun

  7. Parallelogram -- from Wolfram MathWorld

  8. Parallelogram - Math.net

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

  10. Parallelogram In Any Quadrilateral - Math is Fun