When can a quadrilateral also be called a rhombus?

When it has the properties of a rhombus, a quadrilateral can be called "rhombus" (It sides must be equal in lenght, its opposite sides must be parallel, its opposite angles must be equal, its diagonals must be perpendicular and bisect each other).

Step-by-step explanation:

It is important the remember that:

1. By definition, a quadrilateral is a polygon that has four sides.

2. A rhombus is defined as a quadrilateral, because it has four sides.

Therefore, you can conclude that a quadriletral can be called a rhombus when it has the properties of a rhombus.

Some of hese properties are shown below:

7

step-by-step explanation: