You do not need to find. If it is a parallelogram, it must be 180 degrees.
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No. Adjacent sides, yes. (Twice the sum)
With a protractor and the sum of the interior angles are 360 degrees.
A parallelogram has four sides. All four sided figures have a sum of the interior angle measures equal to 360°.
The 4 interior angles of a parallelogram add up to 360 degrees
They are called supplementary angles.