Complementary *angles*.
:D
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That's the definition of "supplementary angels".
Interior angles: 1620 degrees Exterior angles: 360 degrees
The sum of all the interior angles of any trapezoid is 360 degrees.
The sum of all four angles inside any 4-sided figure is always 360 degrees.
The 5 angles add up to 540 degrees and each interior angle measures 108 degrees