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Use the properties of parallelograms to solve for missing sides, angles, and diagonal segments.
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1. Regents Prep: Theorems with Parallelograms
2. Shmoop (Video): Properties of Parallelograms
3. Math is Fun: Parallelograms
4. Online Practice Quiz #1: Properties of Parallelograms
5. Online Practice Quiz #2: Proving a Quad. is a Parallelogram