A rhombus with right angles is a square. Here's why:

• A rhombus is a quadrilateral with all sides equal in length.
• A right angle means the angle measures $90^\circ$.

For a rhombus to have right angles, all four angles must be $90^\circ$. This means the rhombus also satisfies the definition of a square, which is a quadrilateral with all sides equal and all angles $90^\circ$. Hence, a rhombus with right angles is essentially a square.

Would you like further details or have any questions?

Here are five related questions that expand on this topic:

1. How can you find the area of a square given its side length?
2. What are the properties of a square in terms of symmetry?
3. How does the diagonal of a square relate to its side length?
4. What is the perimeter of a square if one side is given?
5. How does a square differ from a generic rhombus?

Tip: The diagonals of a square bisect each other at right angles and are equal in length.