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Quadrilaterals - Square, Rectangle, Rhombus, Trapezoid, Parallelogram
Parallelogram - Wikipedia
Parallelogram - Definition, Types, Properties, Shapes, Examples
Parallelograms. Properties, Shapes, Sides, Diagonals and Angles …
Properties of Parallelogram - Theorems, Proof, Examples | Parallelogram …
Parallelogram - Math is Fun
Parallelogram -- from Wolfram MathWorld
Parallelogram - Math.net
Parallelogram - Definition, Types, and Examples - Basic-mathematics.com
Parallelogram In Any Quadrilateral - Math is Fun