 Manipulative 2: Parallelogram. Created with GeoGebra. 

Click on the blue points in manipulative 2 and drag them to change the figure. Click
on the checkboxes to see the respective properties demonstrated.
 The opposite angles of a parallelogram are
congruent.
 The opposite sides of a parallelogram are congruent and parallel.
 The diagonals
bisect
each other.
 Each diagonal bisects the parallelogram into two congruent triangles.
 The sums of the angles of a parallelogram is 360° or 2π radians.
 A tesselation of a plane can be created using any parallelogram.
 The area of a parallelogram is A = bh where A is the area,
b is the base and h is the height.
