The sides can add up to any value whatsoever.
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No.
Yes, the opposite sides of a parallelogram are congruent.
When you add all four sides of a quadrilateral(all parallelograms are quadrilateral), It must equal 360 degrees. So what you do is you add up the three angles that are given, them subtract that sum from 360.
A parallelogram is a quadrelateral with opposite sides parallel and congruent.
Yes. That would make all sides congruent; in this case, your parallelogram would be a rhombus.