Arhombus a quadrilateral.
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  "is always"

Step-by-step explanation:

A rhombus is a 4-sided polygon that has all sides equal lengths. It is a quadrilateral and a parallelogram. A square is a special case of a rhombus.

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.