1. a rhombus is a parallelogram with equal length sides. Therefore a rhombus is a parallelogram by definition.
2. a rhombus is a quadrilateral with equal length sides, opposite sides that are parallel, and opposite angles that are congruent. This is just another way of stating the first definition. Therefore, a rhombus is a parallelogram by definition.
John
My calculator said it, I believe it, that settles it