ABCD is a parallelogram. Change the shape of the parallelogram by moving the three sliders.

- What do you notice about each pair of co-interior angles? What does this indicate about the opposite sides?
- List all properties of the parallelogram.
- What additional properties would ABCD need to have to be considered a rhombus? Move the sliders so that a rhombus is formed.
- What additional properties would the rhombus in question (3) need to have to be considered a square? Move the sliders so that a square is formed.