What Is a Rhombus?

|Quantity A|Quantity B|
|---|---|
|Area of quadrilateral _ABCD_|4 x (Area of triangle _AOB_)|
Correct!
A quadrilateral with all sides of equal lengths is a rhombus. In a rhombus, the diagonals bisect each other.

Since each of the four triangles within the rhombus has sides with the same lengths, those four triangles have the same area, and four times the area of one of the triangles will equal the area of the whole rhombus.
Therefore, the two quantities are equal.
Incorrect.
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The rhombus is divided into four triangles. The question to answer is whether those four triangles have the same area or not.
Incorrect.
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The rhombus is divided into four triangles. The question to answer is whether those four triangles have the same area or not.
Incorrect.
There is enough information here to determine a correct answer.
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Quantity A is greater.
Quantity B is greater.
The two quantities are equal.
The relationship cannot be determined from the information given.