Interior angles add up to 360 degrees.
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In all parallelograms, opposite angles are equal and the 4 interior angles add up to 360 degrees. In someparallelograms, all of the angles are 90 degrees. These parallelograms are rectangles.
The angles of a parallelogram can vary but the interior angles will always add up to 360 degrees, as it is a quadrilateral.
Parallelograms have consecutive angles that are supplementary and add up to 180 degrees
With great difficulty because all parallelograms have 4 interior angles that add up to 360 degrees.