Answer: When a rhombus has four equal angles that measure 90°, it can be called "a square".
Explanation:
It is important to remember that, by definition, a Quadrilateral is a polygon that has four sides.
A rhombus is a quadrilateral because it has four sides. Some properties of a rhombus are:
- All its sides are equal in length.
- Its opposite sides are parallel.
- Its opposite angles are equal.
A square is also a quadrilateral, because it has four sides.
These are some of its properties:
- All its sides have equal lenght.
- Its opposite sides are parallel.
- All its angles measures 90° (also known as "right angles")
Based on this, we can conclude that a square is a rhombus.
Therefore, when a rhombus has four equal angles that measure 90°, it can be called "a square".