They all add up to 360 degrees. Also, opposite angles are congruent (equal) and any two adjacent/consecutive angles add up to 180 degrees. This term is also called supplementary.
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The 4 interior angles of a parallelogram add up to 360 degrees
The 4 interior angles of a parallelogram add up to 360 degrees
The 4 interior angles of a parallelogram add up to 360 degrees
A parallelogram has 4 sides and 4 interior angles that add up to 360 degrees
A rectangle has 4 interior equal angles of 90 degrees each and it is technically a parallelogram.