Practice finding the area of a parallelogram. The formula is Area = base × height.
Area = base × height, using the straight-up (perpendicular) height, not the slanted side. A parallelogram with a base of 9 and a height of 6 has an area of 54 square units.
Cubles kits are geometry in your hands: nets, faces, edges and vertices that fold and click into a poseable 3D character. No scissors, no glue, about 15 minutes.