You know that a rhombus is simply a parallelogram with four congruent sides. Furthermore, you only need to know that two consecutive sides are congruent in order to prove the parallelogram is indeed a rhombus. Aside from these characteristics, the rhombus has other interesting properties--particularly the properties of its diagonals. The rhombus diagonals do something special to the angles at each vertex. Play the game below to see if you can figure out what they do.