The sum of supplementary angle is 180 deg.
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Two right angles (90 degrees each) equal 180 degrees (a straight angle).
A trapezoid is a quadrilateral. All quadrilaterals have four angles whose sum is 360 degrees. If two of the angles are right angles, that accounts for 180 degrees of the total. Therefore, the other two angles must total 180 degrees as well.
Supplementary angles total 180 degrees.
SUPPLEMENTARY ANGLES are two angles the sum of whose measures is 180 degrees.
Supplementary angles add up to 180 degrees