Technically it is because a rhombus is a parallelogram that has four sides of equal length in the same way that a square is technically a rectangle that has four sides of equal length.
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An equilateral parallelogram is a rhombus.
If the sides of a parallelogram are all of the same length then it is a rhombus. Thus, a rhombus is a special type of parallelogram.
Every rhombus is a parallelogram.
False.Every parallelogram is not a rhombus, but every rhombus is also a parallelogram.
Technically, a rhombus is a parallelogram, but a parallelogram is not always a rhombus. A parallelogram is any four-sided shape with two sets of parallel lines. A rhombus is a parallelogram with all equivalent side lengths. So, a rhombus is a more specific parallelogram. (And so is a a square or a rectangle.)