The interior angles of a rectangle sum to 360o.
90 x 4 = 360.
While it is true that 4 x 90 is 360, it is not necessary to make this calculation.The interior angles of any quadrilateral sum to 360, regardless of whether or not any of them are right.
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Supplementary angles are two angles that add up to 180 degrees. In other words, if you have one angle measuring x degrees, its supplementary angle will measure 180 - x degrees.
Supplementary angles add up to 180 degrees
Supplementary angle add to 180 degrees. So the supplement to a 60 deg angle is 180 - 60 = 120 degrees.
Supplementary angles add up to 180 degrees
The supplement of an angle is the angle that, when added to the given angle, results in a sum of 180 degrees. In this case, if we add 33 degrees to 147 degrees, the sum is 180 degrees, so 147 is the supplement of 33.