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Investigating Parallelograms

In this picture you're given a parallelogram. Drag the vertices to answer the following questions.
  1. What seems to be true about the sides of the parallelogram?
  2. What seems to be true of the angles?
  3. How about the diagonals?

  4. Explain how you could drag the figure to make a rectangle. What has to be true to make it a rectangle?
  5. How would you make it into a rhombus? What's true now?
  6. Can you make it into a square?