How many right angles does a rhombus have?

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Answer:

If a rhombus is a square, all four of its angles are right.
Otherwise, all angles are either acute or obtuse, but not right.

Explanation:

As a parallelogram, rhombus has a sum of two interior angles that share a side equal to #180^@#.
Therefore, only if all angles are equal, they all are equal to #90^@#.
That equality of all angles makes a square out of rhombus.

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