Answer
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Step-by-step explanation
Supplementary angles are angles that sum up to give 180 degrees.
And for all rectangles, whether a square one or non-square one, all of the angles of the rectangle are each 90 degrees.
So, it is clear that any two same side angles will be 90° + 90° = 180°
Meaning that same side angles of a non-square rectangle are supplemental.
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