81a²-25 would be the answer I'm pretty sure. Hopefully I helped.
Answer:
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Step-by-step explauuuuuuuuuuu
Im doing something similar to this you wanna help each other out?
Answer:
No, a rhombus is a quadrilateral, with four equal-length sides and opposite sides parallel to each other. All rhombuses are parallelograms, but not all parallelograms are rhombuses. The opposite interior angles of rhombuses are always congruent. A parallelogram is just a four sided closed shape where opposite sides are parallel.
I hope this helps!
