Lots of Parallelograms - Extension

Draw non-rectangular parallelograms with the following areas and check with the area tool. Do you notice relationships between any of the parallelograms?
  • 20 square units
  • 10 square units
  • 36 square units
  • 9 square units
Choose one of the parallelograms and change the position of the corners. How does that affect the area? Why?