Explore special parallelograms by following these steps.

✓ 1. Move vertex A so that ∠BAD is a right angle. What do you notice about the diagonals? The diagonal lengths are equal. The diagonals are perpendicular.

✓ 2. Move vertex A so that the sides are all congruent. What do you notice about the diagonals? The diagonal lengths are equal. The diagonals are perpendicular.