Veterans with health insurance may choose to use their private health insurance to supplement their VA benefits. Payments from private health insurance usually cover copay expenses for VA health care. Having private health insurance does not affect eligibility for VA health care.
If the shape is below another, then it is always the shape above it as well. So a rhombus is always a parallelogram, a square is always a rectangle, and always a parallelogram, and always a quadrilateral, etc. If I could draw the arrows in this reply it would look better.
A: A rhombus is an equilateral parallelogram, which is a two-dimensional, four-sided figure in which opposite sides are parallel and all sides have equal length. A square fits this definition. However, it is usually considered a special case, and some definitions of a rhombus specify that squares are not included.