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You do not need to find. If it is a parallelogram, it must be 180 degrees.
No parallelogram can have only one right angle. The consecutive angles of a parallelogram must be supplementary, meaning they must add up to 180. 180-90=90, so all the angles must be right angles.
No. In fact a parallelogram does not add up. It has a perimeter, it has an area, it has four angles and they are or can be added up. The the parallelogram itself cannot.