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There are not any, because if it had any 90 degree angles it would be a square.
A rhombus has four equal sides, but it is not necessarily a square. Think of it as a square that can be stretched. Thus, it will have four angles and opposite angles will be the equal. A special case of a rhombus is a square and then, all four angles will be equal 90 degrees.
There are 4 angles on a rhombus.
A rhombus may be a square or just a rhombus (a rhombus is merely called a rhombus when there are no 90 degree angles).
This depends to some extent on context.A rhombus is a parallelogram with all sides equal. On this basis a rhombus with 90 degree angles is just a square. Some authorities insist on defining a rhombus as not containing any right angles.